A social security number (SSN) is a unique nine-digit number issued to U.S. citizens, permanent residents, and certain temporary workers. It is used to track earnings and benefits for Social Security and Medicare programs. You will need an SSN to work legally in the United States and to access various government services and benefits.
There are several ways to apply for an SSN, depending on your circumstances. If you are a U.S. citizen or permanent resident, you can apply online, by mail, or in person at a Social Security office. You will need to provide proof of your identity and citizenship or permanent residency status. If you are a temporary worker, you will need to apply for an SSN through your employer.