The Supplemental Security Income (SSI) program pays benefits to disabled adults and children who have limited income and resources.
If you have a long enough work history and limited income and assets, you may be able to receive Social Security disability or retirement benefits as well as SSI.
The limit for "countable resources" (assets) for an SSI recipient is $2,000 for an individual and $3,000 for a couple. The Social Security Administration does not count your home nor the first car you own in these assets.
Any income you receive above $20 per month may limit your SSI benefit. Countable income includes wages, Social Security benefits, state disability payments and "deemed income" which is said to be "shared" by folks you live with (spouse or other family members).
If you meet the income and asset limits, you may apply for SSI if you're a child with a disability, an adult with a disability, or a senior age 65 or older (with or without disability).