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Unique Identification Authority of India - Aadhaar

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Glossary

The glossary section helps users understand Aadhaar-related terminology, authentication concepts, ecosystem entities, technical processes, and commonly used definitions in a simple and accessible manner. Find information on Aadhaar services, AUAs, ASAs, authentication devices, APIs, seeding, verification and other key terms used across the Aadhaar ecosystem.

Aadhaar

Aadhaar is a 12 digit individual identification number issued by the Unique Identification Authority of India on behalf of the Government of India.

Aadhaar Holder

Aadhaar Holder is an individual who holds an Aadhaar Number.

Aadhaar Number

Aadhaar Number is the unique identification number issued to a an Aadhaar number holder by UIDAI

Aadhaar Enabled Services

Aadhaar Enabled Services is services provided by an Authentication User Agency to Aadhaar Holder, using the Aadhaar Authentication Services of UIDAI.

Aadhaar Authentication Services

Aadhaar Authentication Services is the authentication services provided by UIDAI and used by Authentication User Agency where the personal identity information of / data of an Aadhaar-holder (who is a beneficiary, customer, employee or associate of the Authentication User Agency is matched with their personal identity information / data that is stored in the UIDAI’s Central Identity Data Repository in order to provide Aadhaar enabled services to such Aadhaar holder.

Aadhaar Seeding

Aadhaar Seeding means linking Aadhaar holder’s Unique 12 digit AADHAAR number with their Personal Identification Documents or Benefit Cards such as:

  1. Scholarships
  2. Pension ID
  3. MNREGA Job Card
  4. LPG Consumer ID
Authentication

Authentication means the process of verifying the UID number of a an Aadhaar number holder with reference to his biometrics.

Authority

Unique Identification Authority of India (UIDAI)

Aadhaar Authentication Services

Aadhaar Authentication Services is the authentication services provided by UIDAI and used by Authentication User Agency where the personal identity information of / data of an Aadhaar-holder (who is a beneficiary, customer, employee or associate of the Authentication User Agency is matched with their personal identity information / data that is stored in the UIDAI’s Central Identity Data Repository in order to provide Aadhaar enabled services to such Aadhaar holder.

API or Application Programming Interface

An application programming interface (API) specifies how some software components should interact with each other.

ASA or Authentication Service Agency

An organization or an entity providing secure leased line connectivity to UIDAI’s data centres for transmitting authentication requests from various AUAs.

AUA or Authentication User Agency

An organization or an entity using Aadhaar authentication as part of its applications to provide services to Aadhaar number holders. Example: Bank

Authentication Data Packet

Authentication Data Packet is a data packet which has been created based on pre-defined protocol (data elements, order of data elements, etc), prescribed by UIDAI from time to time and which contains Personal Identity Data (PID) collected from Aadhaar Holders for the purpose of Aadhaar Authentication.

Authentication Device

Authentication Device is a terminal or device from where the Authentication User Agency carries out its service/business functions and interacts with Aadhaar Holders, by seeking authentication of Aadhaar Holders identity to enable the Authentication User Agency’s business function.

ATM

Automated Teller Machine

BC or Business Correspondent

Business Correspondent is a term for banking channel for rural India.

B-FTE

Biometric Failure to Enrol

BFD Best Finger Detection

Best Finger Detection means identification of the best finger(s) to improve authentication accuracy and hence be more inclusive in supporting Aadhaar authentication across all sections of society.

BPL

Below Poverty Line

Biometric Information

Biometric Information shall mean face photograph, ten finger prints and iris image of an individual seeking to enrol, captured by UIDAI, as a part of the enrolment process for issuance of Aadhaar Number.

Biometric Data

Biometric Data refers to the facial image, iris scan and fingerprints collected by the Enrolment Agency from the enrollees based on the standards prescribed by the UIDAI and by following the process laid down for the purpose. The data collected is passed onto the UIDAI as per the process prescribed.

CSC

Common Service Centres operating as franchisees of Service Center Agency (SCA) within a State, as part of the CSC Scheme of the National E-Governance Plan of India.

CSO

Civil Society Outreach, an invitation undertaken by UIDAI to get learnings from NGOs on issues related to Migrant labour, homeless etc.

CGHS

Central Government Health Scheme

CSV

Comma Separated Variables or values, a simple file format for Computer which is widely used due to ease.

CIDR or Central ID Data Repository

CIDR is the data centre/s where data of individuals enrolled and Aadhaar number holders is stored and accessed from.

De-duplication

De-duplication is the process of using the Demographic and Biometric data collected from an enrollee to check against rest of the data so as to avoid duplicate enrolments.

DoB

Date of Birth

Demographic Data

Demographic Data refers to the personal information collected or verified by the Enrolling Agency based on the data fields prescribed by the UIDAI and by following the process laid down for the purpose. The data collected is passed on to the UIDAI as per the process prescribed.

DIT

Department of Information Technology

DDSVP or Demographic Data Standards and Verification Procedure

The UIDAI set up the Demographic Data Standards and Verification Procedure Committee (Data standards committee) chaired by Shri N. Vittal. The Data Standards Committee submitted its report on December 9, 2009.

e-KYC

Electronic Know Your Customer - an electronic substitute which is instant and paperless for industry use to meet KYC requirement of Banking, Telecom etc.

ECHS

Ex-servicemen Contributory Health Scheme.

eGoM

Empowered Group of Ministers.

Enrolment

Enrolment refers to the exercise of collection of demographic data after verification, collection of biometrics, and the allocation of the UID number after de-duplication.

Enrolment Centre

Enrolment Centre refers to the premises located in the area where the enrolment is being carried out. One Enrolment Centre can host multiple Enrolment Stations.

Enrolment Station

Enrolment Station refers to an individual enrolment booth/enclosure inside the Enrolment Centre. The capture of Demographic and Biometric data is done in this Station.

FPIR

False Positive Identification Rate which describes the proportion of identification transactions by users not enrolled in the system, in which an identifier is returned.

FI- Financial Inclusion

Programme of banking industry to expand banking to rural India.

FTE or Failure to Enrol

Failure to Enrol refers to the failure of the biometric system to form a proper enrolment template for an end-user. The failure may be due to failure to capture the biometric sample or failure to extract template data (of sufficient quality)

G2C

Government –to- Citizen or transactions of Government which are targeted to large population.

G2G

Government-to-Government are those transactions that are with Central or State Government.

IFSC

IFSC or Indian Financial System Code which is the code used by banking industry to identify a particular Branch.

IOCL

Indian Oil Corporation Ltd.

ISO International Standards Organization

ISO (International Organization for Standardization) is the world’s largest developer of voluntary International Standards. International Standards give state of the art specifications for products, services and good practice, helping to make industry more efficient and effective. Developed through global consensus, they help to break down barriers to international trade

KSA or KYC Service Agency

A valid ASA who has been approved and has signed the agreement to access KYC API through their network

KUA or KYC User Agency

A valid AUA who has been approved and has signed the agreement to access KYC API

On the lines of KYC of Banking Industry like e.g, Ration Card Number or welfare beneficiary identity number

KYR+

Fields required in addition to KYR fields required by the Registrars

MNREGA

Mahatma Gandhi National Rural Employment Guarantee Act

Manual

Enrolment Manual

MoU

Memorandum of Understanding

NGO

Non-Government Organization

NPR

National Population Register, which is a programme of Registrar General of India/Census Office for enrolling and assigning ID numbers to individuals seeking to enrol

NREGA

National Rural Employment Guarantee Act

OTP – One Time Password

OTP is a one time personal identification number generally, sent to the mobile phone number for authentication framework.

Operator

Operator is the person employed by the Enrolment Agency and engaged in the capture of Demographic and Biometric Data.

ORGI

Office of Registrar General of India

PID or Personal Identity Data (PID)

Aadhaar-based Personal Identity Data /Information including biometric and demographic information as well as the OTPused for Authentication

PoC

PoC or Proof-of-Concept is a programme undertaken in a smaller denomination to test the usefulness of the programme.

PoR

PoR or Proof of Relation is used in the context of minor getting enrolled in UIDAI.

RFP

Request for Proposal which is the term to denote tender or procurement formalities

RGI

Registrar General of India

RSBY

Rashtriya Swasthya Bhima Yojana

RDPR

Rural Development and Panchayati Raj

RBI

Reserve Bank of India

STQC

STQC or Standardisation Testing and Quality Certification : Directorate Standardisation Testing and Quality Certification (STQC) Directorate is an attached office of the Department of Electronics and Information Technology(DeitY), Government of India, provides quality assurance services in the area of Electronics and IT through countrywide network of laboratories and centres.

TIN

Temporary Identification Number provided by RGI

UIDAI

Unique Identification Authority of India

UID

Unique Identification

UNICODE

Globally accepted standard definition of local language characters in a Computer system. Character sets defined by Unicode Consortium.

USB

Universal Serial Bus

VID (Virtual ID)

VID or Virtual ID is a temporary, revocable 16-digit random number mapped with the Aadhaar number. VID can be used in lieu of Aadhaar number whenever authentication or e-KYC services are performed. Authentication may be performed using VID in a manner similar to using Aadhaar number. It is not possible to derive Aadhaar number from VID.

Content Information

Published on: 30 Apr 2026

Last Updated: 23 May 2026

Owner: Shubham

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Content Information

Published on: 30 Apr 2026

Last Updated: 23 May 2026

Owner: Shubham

Glossary - Unique Identification Authority of India | Government of India - Unique Identification Authority of India | Government of India