Supplemental Security Income (SSI) is a federal program in the United States that provides financial assistance to individuals who have limited income and resources. It is designed to help elderly people, as well as those who are blind or disabled, meet their basic needs for food, clothing, and shelter. SSI benefits are funded by general tax revenues, not Social Security taxes. To qualify for SSI, applicants must meet specific income and resource limits, as well as other eligibility criteria. The program is administered by the Social Security Administration (SSA), which evaluates applications and determines benefit amounts based on individual circumstances.