Social Security is any government system that provides monetary assistance to people with inadequate or no income.
Social Security Number
SSN is a 9 digit number in the format of XXX-XX-XXXX. It is given to all U.S citizens, permanent residents and temporary residents who work in the U.S. Its primary purpose was to "track individuals income for taxation".
Importance of SSN
It is very important to remember your SSN because it is the only proof of your identity. The law "assumes" that no one other than you, except your employers, banking person, credit card companies, and other financial related people know that number. It is fraud for someone else in the list above to steal your number and distribute or use it for something else.
People can steal your identity if they know your SSN and birthdate completely. People can pretend to be you and call the bank or another place and tell them all your info including