What is the purpose of a social security number?

A Social Security number (SSN) serves primarily as a unique identifier for individuals within the United States, primarily for tracking earnings and benefits within the Social Security system. It is used by the government to administer social security benefits, including retirement and disability payments. Additionally, SSNs are often required for tax purposes and to access various services, such as opening bank accounts and applying for loans. Overall, it plays a crucial role in identifying individuals for various legal and financial transactions.