A national identification number is used by the governments of many countries as a means of tracking their citizens, permanent residents, and temporary residents for the purposes of work, taxation, government benefits, health care, and other governmentally-related functions. Sometimes, the number will appear on an identity card issued by a country.
The ways in which such a system is implemented is dependent on the country, but in most cases, a citizen is issued a number at birth or when they reach a legal age (typically the age of 18). Non-citizens are issued such numbers when they enter the country.
Many countries issued such numbers ostensibly for a singular purpose, but over time, they become a de facto national identification number. For example, the United States originally developed its Social Security Number system as a means of disbursing Social Security benefits. Due to functionality creep, the number has become utilized for other purposes to the point where it is almost essential to have one in order to, among other things, open a bank account, obtain a credit card, or drive a car.
Answered by
Sandeep
at
7:11 PM on October 01, 2008