A more thorough explanation:

Definition: SSI stands for Supplemental Security Income. It is a government program that provides financial assistance to people who have low income and limited resources and are aged, blind, or disabled.

Example: John is a 65-year-old man who has a disability and lives alone. He has no income and no savings. He applies for SSI and is approved. He receives a monthly payment from the government to help him pay for his basic needs, such as food, housing, and medical expenses.

Explanation: The example illustrates how SSI works. John is eligible for SSI because he has a disability and no income or savings. The government provides him with financial assistance to help him meet his basic needs. This is the purpose of the SSI program.