SSN - In the USA ,
each person who has become a citizen of the United States or is born here has been allotted a social security number. But what exactly is this number? A social security number (S.S.N) is the basic identification of any person in the USA . Each person has his or her own unique combination of 9 to 10 digits which is used to get a driving license, loans, employment or any other thing that a person may want and require in his or her life.
You need a Social Security number to get a job, collect Social Security benefits and receive some other government services. But you don't often need to show your Social Security card. Do not carry your card with you. Keep it in a safe place with your other important papers.