The Social Security Administration runs two programs for people who are disabled. The two programs have the same rules about disability, but different rules for financial eligibility.
The Supplemental Security Income (SSI) program is for people who are disabled and have very low income and assets. You do not have to have worked to get SSI. A single person has to have less than $2,000 and a couple has to have less than $3,000.
The Social Security Disability (SSDI) program is for people who are disabled and who have worked and paid into the Social Security system. For the SSDI program, it does not matter how much money you have.
Some people get some money from both programs.