A national ID is an official identification document issued by a government to its citizens. It serves as proof of identity and can be used for various purposes, such as voting, accessing government services, and traveling within the country. National IDs often include personal information like name, date of birth, and a unique identification number. Many countries have implemented national ID systems to enhance security and streamline administrative processes. For example, in India, the Aadhaar system provides residents with a unique ID number linked to their biometric data. This helps in verifying identities and reducing fraud in public services.