<human>:  Explain what is the meaning of the term Social Security Number.
<bot>: A Social Security Number (SSN) is a nine-digit number assigned to a person by the Social Security Administration (SSA). It is used for taxation, identification, and other financial and legal purposes, and is essential for accessing government benefits. SSN is used to keep track of an individual's records in the SSA database, such as their work history, wages, and payment information.