SSN

A Social Security Number (SSN) is a nine-digit number issued by the Social Security Administration to U.S. citizens, permanent residents, and certain other eligible non-citizens. The SSN is used to track an individual's earnings and tax liabilities over their working lifetime, and to manage Social Security benefits. SSN is a highly sensitive personal identifier and is protected by law, as it can be used to commit identity theft, file false tax returns, and create false identities.