After enrolment, NIMC issues a National Identification Number (NIN), which is a unique number that identifies an individual for life. It’s used to match a person’s biometric data and other information in the National Identity Database (NIDB). NIN is a number that is used to link all of a person’s information in Nigeria’s national database and to verify their identification. All citizens and legal residents in Nigeria, from age zero (birth) and above are eligible to enroll for their NIN.