India Comparison Glossary

NABH — National Accreditation Board for Hospitals & Healthcare Providers

India's flagship hospital quality-accreditation body, run under the Quality Council of India. NABH-accredited hospitals are independently verified on 600+ patient-safety, infection-control, surgical-care, and credentialed-staff measures. Hospitals can hold full NABH accreditation, entry-level NABH accreditation, or NABH-blood-bank only — each represents progressively higher standards. NABH is now effectively the metro hospital baseline in India; 97% of WIB's tracked metro hospitals hold it, vs 68% in tier-3 cities.

See also: JCI, NABL, State of Indian Hospitals 2026

JCI — Joint Commission International

The global gold-standard hospital accreditation, US-based and applied internationally. JCI matters most for medical-tourism inflow — international patients often filter for JCI-accredited hospitals. Only about 12% of WIB's tracked Indian hospitals hold JCI, primarily large private chains (Apollo, Fortis, Medanta, Manipal, Max) and a few independent units. Tier-3 cities have zero JCI-accredited hospitals.

See also: NABH, Medical tourism

NABL — National Accreditation Board for Testing & Calibration Laboratories

The accreditation standard specifically for medical labs and diagnostic centres in India. NABL is to labs what NABH is to hospitals. When a hospital displays both NABH + NABL marks, it means both the hospital and its in-house lab are independently accredited.

CGHS — Central Government Health Scheme

India's central-government employee health insurance, covering current and retired central-government employees and their dependents. CGHS-empanelled hospitals offer cashless treatment at fixed government rates. About 95% of metro multi-specialty hospitals in WIB's dataset are CGHS-empanelled.

See also: Ayushman Bharat, ESIC

Ayushman Bharat / PMJAY

India's largest public health-insurance scheme (full name: Pradhan Mantri Jan Arogya Yojana), covering ~50 crore of India's most economically vulnerable population for hospitalisation costs up to Rs 5 lakh per family per year. Empanelled hospitals serve PMJAY beneficiaries at fixed government rates. AB-PMJAY empanelment is most common at government and trust hospitals.

ESIC — Employees' State Insurance Corporation

Health insurance for workers in the organised sector earning under Rs 21,000/month and their dependents. ESIC operates its own network of hospitals and clinics, and also empanels third-party hospitals.

Multi-specialty hospital

A hospital with three or more major medical specialties under one roof (typically cardiology, neurology, orthopedics, general surgery, gynaecology, paediatrics). This is the most common Indian hospital type in WIB's data. Bed counts range from ~100 (smaller cities) to 3,000+ (the largest metro hospitals).

See also: Super-specialty, Quaternary care

Super-specialty hospital

A hospital specialised in advanced sub-disciplines of medicine — cardiac surgery, neurosurgery, oncology, nephrology + dialysis, organ transplant. The term implies the hospital handles complex cases that smaller multi-specialty hospitals refer out. AIIMS, Apollo, Medanta, Fortis Memorial, MIOT, CMC Vellore are typical examples.

Quaternary care

The highest tier of medical care — solid-organ transplants (liver, lung, kidney), bone-marrow transplants, complex pediatric oncology, robotic surgery, advanced clinical trials. Quaternary care in India is concentrated in 30-40 hospitals across the top 6 metros. WIB's data shows it's largely absent from tier-3 cities (only 5 of 40 tier-3 hospitals offer transplants).

See also: Beyond the Metros report

Medical tourism

Patients travelling to India specifically for healthcare — typically from Bangladesh, Africa, the Middle East, and increasingly the West. JCI-accredited hospitals in Chennai, Mumbai, Delhi, and Bangalore dominate medical tourism inflow. Procedures most travelled for: cardiac surgery, organ transplants, orthopedic surgery, IVF, dental work, and Ayurveda.

ICU vs HDU

ICU (Intensive Care Unit) is for critically ill patients needing constant 1:1 nursing care, ventilator support, multiple organ-support equipment. HDU (High Dependency Unit) is a step-down between ICU and a regular ward — patients still need closer monitoring than wards but are stable enough not to need full ICU resources. Most multi-specialty hospitals have separate cardiac ICU (CCU), pediatric ICU (PICU), neonatal ICU (NICU), and HDU beds.

IPD vs OPD

IPD (In-Patient Department) covers admitted patients staying overnight or longer. OPD (Out-Patient Department) covers consultations, day procedures, and follow-ups that don't require admission. Hospital "OPD" usually refers to consultation chambers; OPD timings (e.g., 9 AM-12 PM) are when doctors are available for walk-in consultation.

TPA — Third Party Administrator

Insurance-claims intermediaries between hospitals and health-insurance companies. When a hospital lists "Most TPA accepted," it means most major health-insurance policies are cashless there. Major Indian TPAs include MediAssist, Vidal, Paramount, Heritage, Family Health Plan.

AIIMS — All India Institute of Medical Sciences

India's premier public medical institutions, governed under the AIIMS Act. AIIMS Delhi (1956) is the original; the AIIMS expansion programme has added 22 new AIIMS hospitals across India since 2003, including those in Bhopal, Patna, Bhubaneswar, Raipur, Mangalagiri, Bibinagar, Gorakhpur, Nagpur, Kalyani. AIIMS hospitals are tertiary-care anchors in their states.

Sadya

The traditional Kerala feast served on a banana leaf — typically 24-28 separate items including rice, sambar, rasam, kalan, olan, avial, pachadi, kichadi, thoran, parippu, payasam (sweet), and pappadams. Sadya is central to Onam and Vishu festivals but is served year-round at restaurants like Mathrubhumi and Ariya Niwas in Trivandrum and family-run kitchens across Kerala.

See also: Trivandrum restaurants

Thali

A round platter with multiple small servings of dishes representing a complete meal. Indian thali traditions vary by region — Gujarati thali (sweet-savoury balance, dhokla, undhiyu, kadhi, rotli), Rajasthani thali (dal baati churma, gatte ki sabzi), Maharashtrian thali (varan-bhaat, puran-poli), South Indian thali (rice, sambar, rasam, multiple sabzis). Most thalis are unlimited refill in restaurants.

See also: Sadya, Best Gujarati Thali in Vadodara

Biryani vs Pulao

Both are layered rice dishes, but: Biryani uses the dum-cooking method — meat (or vegetables) and partially-cooked rice are layered in a sealed pot and slow-cooked together so the rice absorbs flavour. Pulao is cooked in one step, like a pilaf — rice and other ingredients are sautéed together. Biryani is heavier, more aromatic, and more festive; pulao is lighter and faster.

See also: Hyderabadi biryani, Lucknowi biryani

Hyderabadi biryani

The kachchi style of biryani — raw marinated meat is layered with partially-cooked basmati rice and dum-cooked together until done. The result is intensely aromatic, often spicier than other styles. Paradise, Bawarchi, Shadab, Pista House are the iconic Hyderabad addresses. WIB's data shows Hyderabad's restaurant scene is ~33% biryani-focused — the highest concentration in India.

Lucknowi biryani (Awadhi)

The pakki style — meat is fully cooked before being layered with par-cooked rice for the dum. Subtler, less spicy, more fragrant with rosewater, saffron, and kewra. The Mughal/Awadhi influence is dominant. Lucknow's top 30 restaurants are ~47% Mughlai/biryani-led in our data — the strongest single-cuisine identity in India.

Saoji

A fiery mutton-curry tradition unique to Nagpur, Maharashtra, originating in the Halba community. Characterised by heavy black pepper, cloves, red chillies, and a thin, intensely-flavoured gravy. Best examples: Sahil Restaurant (Mominpura), Ashoka Hotel (Trimurti Nagar), Vidarbha Saoji. WIB's data shows Saoji is Nagpur's most distinctive cuisine signal.

See also: Best Saoji in Nagpur

Chettinad cuisine

The Tamil cuisine of the Chettiar community from the Sivagangai district — heavy on freshly-ground spice masalas (star anise, kalpasi/stone flower, marathi mukku/dried flower), chillies, and sun-dried meats. Strongly associated with Chettinad chicken, Chettinad mushroom, and Karaikudi mutton. Spreads from Karaikudi and Madurai outward, now common in Chennai and Coimbatore.

Dosa varieties

Dosa is a fermented rice-and-lentil crepe. Common varieties: Plain dosa (just the crepe), masala dosa (filled with spiced potato), rava dosa (semolina-based, crispier, no fermentation), set dosa (thicker, served in stacks of 2-3), uttapam (thick, topped with onion/tomato/chillies), Mylari butter dosa (Mysore signature — small, soaked in melted butter), paper dosa (extra-thin, extra-long, crispy).

See also: Best Mysore tiffin

Mughlai cuisine

The cuisine of the Mughal courts (16th-19th century) — rich, dairy-heavy, dry-fruit-laden, slow-cooked. Signature dishes: korma, rezala, biryani, kebab varieties (seekh, galouti, kakori), nihari, kulfi. Strongest preserved in Lucknow (Awadhi), Hyderabad, Delhi (old city), and Bhopal. Distinct from "North Indian" generally — Mughlai is a sub-genre.

Litti chokha

Bihar's signature dish — sattu (roasted gram flour) and spice-stuffed wheat balls, roasted (traditionally over cowdung-cake fire) and served with chokha (mashed roasted aubergine, potato, or tomato), generous mustard oil, ghee, and pickles. Chacha Ki Hotel and Litti Hub on Patna's Boring Road are the consensus benchmark.

See also: Best Bihari in Patna

Undhiyu

A Gujarati winter speciality from Surat — mixed vegetables (purple yam, green beans, surti papdi, baby aubergines, sweet potatoes) and fried muthia (fenugreek dumplings) cooked together in a pot, traditionally upside-down, hence the name (undhiyu = "upside-down" in Gujarati). Strong association with Uttarayan (Makar Sankranti).

Surati locho

A steamed chickpea-flour cake topped with coriander, sev, lemon juice, and garlic chutney — Surat's most distinctive street-food signature. Locho is closer in texture to a soft dhokla but with stronger garlic and chilli. Best at Surati Locho King in Bhagal, Dholu Maharaj in Chowk Bazaar.

Khorika

Assamese tribal cooking — characterised by bamboo-shoot, smoked meats (pork, duck, fish), fermented ingredients, and minimal spice. Distinct from mainstream Indian cuisine. Khorikaa and Heritage Khorikaa in Guwahati are flagship restaurants. Naga cuisine (smoked pork with bamboo shoot, akhuni-based dishes) is a related but distinct Northeast tradition.

See also: Best Assamese in Guwahati

Odia thali

Odisha's regional thali — dalma (toor dal cooked with vegetables and tempered with panch phoran), santula (light mixed-veg curry), dahi macha (curd-fish), chhena poda (cottage-cheese cake-dessert), and chudaa (flattened rice). Less commercialised than Bengali or Gujarati thali traditions, but increasingly visible in Bhubaneswar restaurants like Dalma, Truptee, Odisha Hotel.

See also: Best Odia Thali in Bhubaneswar

Filter coffee

The South Indian method — coffee decoction is dripped slowly through a stainless-steel filter, then mixed with hot milk and sugar and served in a small metal tumbler with a wider davarah (cooling dish). Strong, sharp, milky. The best filter coffees in India: Chennai (any Saravana Bhavan or MTR descendant), Madras Coffee House (Coimbatore), Indian Coffee House network (across India).

CBSE — Central Board of Secondary Education

India's largest and most-recognised school board, run by the central government. CBSE syllabus is uniform across India and internationally well-recognised. Approximately 20,000+ schools are CBSE-affiliated. Strong fit for families that move cities, plan engineering/medical entrances (CBSE syllabus closely tracks JEE/NEET), or aim for international university applications.

See also: ICSE, IB

ICSE — Indian Certificate of Secondary Education

Council for the Indian School Certificate Examinations (CISCE) administers ICSE (class 10) and ISC (class 12). Traditionally considered more rigorous on English language, with broader humanities exposure than CBSE. About 2,300 schools affiliated. Stronger fit for families prioritising language depth, English-medium humanities, or arts-oriented careers.

IB — International Baccalaureate

Switzerland-headquartered international curriculum offering the IB Diploma Programme (DP) for ages 16-19 plus PYP (Primary Years) and MYP (Middle Years). Globally portable, strong in critical thinking, requires Extended Essay + CAS (Creativity-Action-Service) + Theory of Knowledge. Strongest fit for families planning international university applications. Fees: Rs 5-15+ lakh per year in India.

IGCSE — International General Certificate of Secondary Education

Cambridge International's Class 10-equivalent qualification, often followed by Cambridge A-Levels for Class 12. Subject-focused, modular, less broad than IB but with academic depth. Common in Indian international schools as an alternative to IB. Fees similar to IB (Rs 5-15 lakh/year).

State Board

Each Indian state has its own school education board (Maharashtra State Board, Tamil Nadu Board, etc.). State boards typically use local-language instruction options and align with state government engineering/medical entrance exams. Often lower-fee than CBSE/ICSE for comparable quality, especially government and government-aided schools.

JEE — Joint Entrance Examination

India's national entrance exam for undergraduate engineering. Two stages: JEE Main (qualifying exam, conducted by NTA) for entry to NITs, IIITs, and other CFTI engineering colleges; JEE Advanced (taken by JEE Main top scorers) for entry to the 23 IITs. India's most-competitive undergrad entrance — typically 1.2-1.5 million candidates for JEE Main, ~250,000 for JEE Advanced.

NEET — National Eligibility cum Entrance Test

The single national entrance exam for undergraduate medical (MBBS, BDS) and AYUSH courses across all medical colleges in India, conducted by NTA. Replaced earlier state-wise medical entrance exams in 2017. Approximately 2 million candidates each year. Score determines admission rank for both government (low-fee) and private (high-fee) medical colleges.

CAT — Common Admission Test (for MBA)

The entrance exam for India's IIMs and most top business schools. ~3 hours, ~66 questions across Quantitative Ability (QA), Verbal Ability + Reading Comprehension (VARC), and Data Interpretation + Logical Reasoning (DILR). 99+ percentile scores are typical for IIM-ABC interviews. Other major MBA entrances include XAT (XLRI), SNAP (Symbiosis), CMAT.

IIMs — Indian Institutes of Management

India's premier MBA institutes — 20 IIMs nationally, with IIM Ahmedabad, Bangalore, Calcutta forming the original "ABC" tier, followed by Lucknow, Kozhikode, Indore (the older institutes), and 14 newer IIMs. 2-year PGP fees range Rs 18-25 lakh; placements average Rs 25-35 lakh for IIM-ABC freshers.

IITs — Indian Institutes of Technology

India's premier engineering institutes — 23 IITs nationally. The original 5 IITs (Bombay, Delhi, Madras, Kanpur, Kharagpur) plus IIT Roorkee, IIT Guwahati, and the newer IITs (Hyderabad, Indore, Mandi, Gandhinagar, etc.). 4-year B.Tech tuition is ~Rs 8-10 lakh total. Admission via JEE Advanced. ~10,000 seats per year across all IITs.

NITs — National Institutes of Technology

India's second-tier government engineering institutes — 31 NITs nationally. Admission via JEE Main. NIT Trichy, NIT Warangal, NIT Surathkal are the top of the NIT tier. 4-year B.Tech total fees Rs 4-6 lakh. Often the most attractive cost-to-quality engineering path in India for non-IIT-qualifiers.

MBBS vs MD/MS

MBBS (Bachelor of Medicine, Bachelor of Surgery) is the 5.5-year undergraduate medical degree (4.5 years study + 1 year mandatory rotating internship). After MBBS, doctors can pursue MD (Doctor of Medicine, for medical specialisations) or MS (Master of Surgery, for surgical specialisations) — 3-year postgraduate degrees. Super-specialisation requires DM/MCh after MD/MS.

B.Sc Nursing vs GNM vs ANM

B.Sc Nursing is a 4-year university-level nursing degree, qualifying for staff nurse and clinical specialist roles. GNM (General Nursing and Midwifery) is a 3-year diploma. ANM (Auxiliary Nurse Midwife) is a 2-year diploma for community-level care.

Tier-1 / Tier-2 / Tier-3 cities

RBI's classification of Indian cities by population: Tier-1 covers the 8 metros (Delhi, Mumbai, Bangalore, Chennai, Hyderabad, Kolkata, Pune, Ahmedabad). Tier-2 covers cities with 50,000-1,00,000 population (Jaipur, Lucknow, Indore, Coimbatore, etc.). Tier-3 covers 20,000-50,000 (Bhopal, Nagpur, Mysore, etc.). The terms are used colloquially with looser boundaries.

See also: All cities on WIB, Metro vs Tier-3 India

NCR — National Capital Region

The Delhi-centred urban agglomeration covering Delhi plus surrounding districts of Haryana (Gurugram, Faridabad, Sonipat), Uttar Pradesh (Noida, Ghaziabad), and Rajasthan (Bharatpur). NCR has roughly 50 million people — larger than most countries. Different state laws apply across NCR municipalities.

MMR — Mumbai Metropolitan Region

The Mumbai-centred urban agglomeration covering Mumbai, Navi Mumbai, Thane, Kalyan-Dombivli, Mira-Bhayandar, Vasai-Virar. Total population ~25 million. Multiple corporations and authorities operate across MMR.

BHK — Bedroom, Hall, Kitchen

Indian real-estate shorthand for apartment size. 1BHK = 1 bedroom + living room + kitchen (~400-650 sqft). 2BHK = 2 bedrooms (~700-1,100 sqft). 3BHK = 3 bedrooms (~1,200-1,800 sqft). Half-rooms are written as 2.5BHK, 3.5BHK. Built-up area vs carpet area distinction matters: carpet area is what you actually walk on.

RERA — Real Estate (Regulation and Development) Act

The 2016 central law requiring real-estate developers to register projects, disclose project details, deposit 70% of buyer money in escrow, and adhere to delivery timelines. Each state has its own RERA authority (MahaRERA, KarnatakaRERA, etc.). RERA-registered project ID should be checked before any purchase.

AQI — Air Quality Index

India uses a 0-500 scale developed by the Central Pollution Control Board. Categories: Good (0-50), Satisfactory (51-100), Moderate (101-200), Poor (201-300), Very Poor (301-400), Severe (401-500). Delhi-NCR routinely crosses 400 in November-January (stubble burning + winter inversion); Bangalore/Pune average 80-120; coastal cities (Mangalore, Kochi) consistently below 90. AQI is a major factor in WIB's City Living Index rankings.

EMI — Equated Monthly Instalment

The fixed monthly payment a borrower makes to repay a loan over the agreed tenure. Used universally in Indian retail finance — home loans, car loans, personal loans, credit-card "EMI on purchases" offers. The EMI amount stays constant; the principal-vs-interest split shifts over time (early EMIs are interest-heavy, later ones are principal-heavy). Use WIB's EMI calculator to estimate EMI for a given principal, rate, and tenure.

SIP — Systematic Investment Plan

A method for investing a fixed amount in mutual funds at regular intervals (typically monthly). The Indian SIP industry crossed Rs 20,000+ crore in monthly inflows in 2024-25. Key benefit: rupee-cost averaging — you buy more units when NAV is low and fewer when high, reducing timing risk. Most equity SIPs are auto-debited from a bank account on a set day each month.

NPS — National Pension System

India's central-government-run defined-contribution retirement scheme. Open to all Indian citizens 18-70. Two account types — Tier I (locked till 60) and Tier II (flexible withdrawal). Tax benefits: contributions up to Rs 50,000 per year qualify for an additional Section 80CCD(1B) deduction over and above the Rs 1.5 lakh 80C limit. Auto-allocation between equity, corporate bonds, and government securities based on age, or active choice.

PPF — Public Provident Fund

A 15-year (extendable) government-backed savings scheme offering tax-free interest (currently 7.1% for Q1 2026). Annual contribution range Rs 500 to Rs 1.5 lakh. EEE category — contribution, interest, and maturity are all tax-exempt. Often described as the safest investment in India because returns are sovereign-guaranteed. Trade-off: 15-year lock-in.

ELSS — Equity Linked Savings Scheme

Tax-saving mutual funds with mandatory 3-year lock-in (the shortest among Section 80C tax-saving instruments). Equity-heavy portfolios, so returns are market-linked but historically have outperformed PPF/NSC over rolling 5-year periods. Each annual contribution unlocks separately after 3 years, not the entire investment together.

HRA — House Rent Allowance

A component of salary structured to provide tax relief on rent paid. The exempt portion is the minimum of: 50% of basic salary (metro cities) or 40% (non-metro), actual HRA received, or rent paid minus 10% of basic. Salaried employees in metros usually save Rs 50,000-1.5 lakh per year in tax via HRA structuring. Rent receipts + landlord PAN (if rent > Rs 1 lakh/year) are required documentation.

ULIP — Unit Linked Insurance Plan

A hybrid product combining life insurance and equity/debt investment in a single instrument. Premiums are split between mortality charges (insurance cover) and market-linked investment. Historically criticised in India for opaque fee structures; 2010 IRDA reforms standardised disclosures. Lock-in is 5 years. Generally considered inferior to keeping insurance (term plan) and investment (mutual funds) separate, but tax structure is attractive for high earners.

Term insurance vs life insurance

Term insurance is pure life cover — pay a low premium, nominee gets the sum assured if you die during the term, nothing if you survive. Life insurance (whole life, endowment, money-back) bundles insurance with savings/investment — premium is much higher, you get something back even if you survive, but returns are typically 4-6% (worse than even FD). The 2026 consensus: buy term, invest the difference.

Health insurance vs Mediclaim

"Mediclaim" historically referred to a specific older type of indemnity-based hospitalisation cover. Modern "health insurance" is broader — includes daycare procedures, AYUSH treatments, pre/post-hospitalisation, OPD covers, and critical illness riders. Star Health, HDFC ERGO, ICICI Lombard, Niva Bupa lead by market share in 2026. Family floater (covers spouse + kids on one sum insured) is the most common Indian structure.

Copay vs Deductible (health insurance)

Both reduce the insurer's payout but differently. Copay: you pay a fixed percentage (usually 10-20%) of every claim, no matter the amount. Deductible: you pay the first X amount of any claim (e.g., Rs 25,000), insurer pays beyond. Higher copay or deductible = lower premium. Senior citizen plans almost always have a 10-30% copay; comprehensive corporate plans usually have neither.

CIBIL Score — Credit Information Bureau (India) Ltd

India's most widely-used credit score, run by TransUnion CIBIL. Range 300-900; 750+ is considered good for loan/credit-card approval. Factors: payment history (35%), credit utilisation (30%), credit mix and tenure (15% each), recent inquiries (5%). You can check yours free once per year directly on CIBIL's website. Equivalent scores from Experian, Equifax, and CRIF also exist and lenders pull from multiple bureaus.

RTO — Regional Transport Office

The state government office that handles vehicle registration, driving licenses, transfer of ownership, fitness certificates, and road tax. Every Indian vehicle's registration number starts with the 2-letter state code + RTO district code (e.g., MH 04 = Mumbai-Andheri RTO; KA 03 = Bengaluru-East). When you buy a car, the dealer typically handles RTO registration; when you sell, the buyer must transfer ownership at the relevant RTO. Online services via Parivahan portal have reduced physical visits since 2020.

Ex-showroom vs On-road price

The single most-misunderstood pricing concept in Indian car/bike buying. Ex-showroom price is the manufacturer's price plus GST + cess + transport. On-road price additionally includes: road tax (varies 5-20% by state — Maharashtra and Karnataka are the highest), registration charges (~1% in most states), insurance (varies by IDV + add-ons), fastag, and TCS (1% over Rs 10 lakh). On-road is typically 12-20% higher than ex-showroom for a Rs 10 lakh car.

BS6 (BS-VI) — Bharat Stage VI emissions norms

India's current vehicle emission standard, equivalent to Euro 6. Mandatory from April 1, 2020 — overnight, all BS4 vehicles became un-saleable as new. Key changes from BS4: lower NOx (75% reduction for diesel), DPF (Diesel Particulate Filter) mandatory on diesels, RDE (Real Driving Emissions) testing, OBD-II (On-Board Diagnostics). The transition forced many small-diesel car models to exit India (Maruti withdrew all diesel below 1.5L). BS6 Phase 2 (additional refinements) effective April 2023.

Hybrid vs Electric vehicle

Hybrid (HEV): combines petrol engine + electric motor + small battery, no plug-in needed (battery charges from regen + engine). Toyota Camry Hybrid, Honda City e:HEV. Strong hybrid (full HEV): can drive on electric alone for short distances. Mild hybrid (MHEV): 48V motor assists engine, can't drive alone. Plug-in hybrid (PHEV): bigger battery, plug-in charging, 40-60km EV range then engine kicks in. Battery electric (BEV): pure electric, no engine, only plug-in. Tata Nexon EV, Mahindra XUV400, MG ZS EV are India's bestsellers.

RAM vs ROM

Both store data on devices but very differently. RAM (Random Access Memory): short-term working memory; everything an app is actively using lives in RAM; cleared when device powers off. More RAM = more apps stay open without reloading. Typical Indian smartphone in 2026: 6-12GB RAM. ROM on phones is colloquially used to mean storage (technically internal storage / eMMC / UFS): permanent storage for OS + apps + your files; persists across power cycles. Typical Indian smartphone: 128-512GB storage. The "6/128" or "12/256" spec format means RAM/storage.

5G vs 4G

5G is the fifth-generation cellular standard succeeding 4G LTE. Key differences: Speed — 5G theoretical max is 10 Gbps vs 4G's 1 Gbps; real-world Indian 5G averages 200-500 Mbps vs 4G's 20-80 Mbps. Latency — 5G is 1-10ms vs 4G's 30-50ms (matters for cloud gaming, video calls). Network density — 5G handles ~1 million devices per sq km vs 4G's ~100K. India's 5G rollout (Jio + Airtel) began October 2022; coverage hit 1.5 lakh+ towers by mid-2024. 5G needs a 5G-capable phone + 5G-enabled SIM/plan + 5G coverage at your location.

OLED vs AMOLED vs LCD/IPS

OLED (Organic Light Emitting Diode): each pixel emits its own light; pure blacks (pixel can turn fully off); higher contrast. AMOLED: Active-Matrix OLED — Samsung's variant of OLED, uses TFT layer for faster pixel response; common on premium phones. LCD/IPS: backlit display; can't achieve true black (backlight bleeds through); cheaper. Mini-LED: LCD with thousands of tiny backlight zones — closes the gap with OLED at lower cost. For phones: AMOLED is the premium choice. For TVs: OLED for picture quality, mini-LED for brightness, regular LCD for budget.

Refresh rate (Hz)

How many times per second a display refreshes its image. 60 Hz is the historical baseline. 90/120 Hz are now standard on mid-range and premium Indian smartphones (smoother scrolling, less motion blur in gaming). 144/165 Hz on gaming phones and monitors. Higher refresh rates drain battery faster — most phones offer "adaptive" or "dynamic" refresh that drops to 60 Hz for static content. Visible benefit plateaus around 120 Hz for most users; 165+ Hz benefits competitive gamers only.

PNR — Passenger Name Record

A 10-digit number identifying your train booking in the IRCTC system (6-digit for airlines via global GDS). PNR is shared by all passengers on a single booking. Use PNR to check current status (Confirmed / RAC / WL with position / CNF), train running status, and seat numbers. PNR status can be checked free on IRCTC, Confirmtkt, RailYatri, or by SMS to 139. Bookings typically reach CNF status from WL through cascading cancellations + ticket release waves.

Tatkal booking timing

IRCTC's expedited reservation scheme for last-minute travel. Booking opens at 10:00 AM for AC classes (1A, 2A, 3A, CC, EC) and at 11:00 AM for sleeper class (SL, 2S), exactly 1 day before the train's journey date. Limited quota per train; competition is intense — confirmed bookings typically close within 60-90 seconds on popular routes. Costs Rs 100-400 above regular fare. Tatkal cancellation refund is minimal (~50% before chart prep, nil after). Booking tips: pre-login with Master List / favourite passengers ready, use IRCTC Master List + saved payment method, network on broadband, click submit at exactly 10:00:00 AM.

Train AC classes (1A, 2A, 3A, CC, EC)

Indian Railways AC accommodation categories. 1A (First AC): 2 or 4-berth lockable cabins, fares roughly 4x sleeper; premium. 2A (AC 2-Tier): 6 berths per bay, curtains; the most popular long-distance choice for families. 3A (AC 3-Tier): 8 berths per bay; cheapest AC option, mass-market. CC (Chair Car): airline-style seating on AC day trains (Shatabdi, Vande Bharat). EC (Executive Chair Car): premium chair car with 2x2 seating + meals; Shatabdi/Vande Bharat top tier. 2S (Second Sitting): non-AC chair seats. SL (Sleeper): non-AC overnight, 8 berths per bay.