Science & Technology·Definition

Aadhaar and Digital Identity — Definition

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Version 1Updated 10 Mar 2026

Definition

Aadhaar, meaning 'foundation' in Hindi, is India's unique digital identity system, providing a 12-digit identification number to every resident of India. Conceived as a cornerstone of the 'Digital India' initiative, its primary objective is to eliminate duplicate and fake identities, thereby streamlining the delivery of government subsidies, benefits, and services directly to eligible beneficiaries.

Unlike traditional identity documents that may be issued by various authorities and are prone to duplication or fraud, Aadhaar is a singular, verifiable identity that relies on both demographic and biometric data, making it robust against impersonation.

The system is managed by the Unique Identification Authority of India (UIDAI), a statutory authority established under the provisions of the Aadhaar (Targeted Delivery of Financial and Other Subsidies, Benefits and Services) Act, 2016.

The UIDAI is responsible for the enrollment, authentication, and management of Aadhaar numbers. The enrollment process involves collecting an individual's demographic information (name, address, date of birth, gender) and biometric information (10 fingerprints, iris scans, and a facial photograph).

This data is then stored in a secure, centralized database known as the Central Identities Data Repository (CIDR).

Once an Aadhaar number is issued, it serves as a proof of identity, but not necessarily proof of citizenship. Its uniqueness is ensured through a de-duplication process, where the collected biometric data is checked against the existing database to prevent multiple Aadhaar numbers from being issued to the same individual. This unique identification enables 'one person, one identity' principle, which is crucial for efficient governance and targeted welfare delivery.

The utility of Aadhaar extends beyond mere identification. It facilitates 'authentication,' a process where the identity of an Aadhaar number holder is verified by matching their biometric or demographic information with the data stored in the CIDR.

This authentication can be performed online, in real-time, using various methods like fingerprint, iris, or One-Time Password (OTP) sent to a registered mobile number. This capability has transformed service delivery, enabling paperless, presence-less, and cashless transactions, thereby reducing corruption and leakage in welfare schemes.

From a beginner's perspective, Aadhaar is essentially a digital key that unlocks access to a multitude of services, making interactions with government and even private entities simpler and more secure, while aiming to ensure that benefits reach the intended recipients.

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