A person's physical or mental disabilities can significantly limit or halt their ability to make a living. Programs such as Social Security Disability Insurance (SSDI) and Supplemental Security Insurance (SSI) may be available for those who are unable to work because of an ongoing medical condition. Learning how Social Security works may help you decide whether and when to apply for these important benefits. This section provides helpful information on the types of Social Security disability benefits that are available, including Social Security disability definitions and medical conditions that qualify. Click on the links below or learn about state-specific laws on our Social Security disability legal answers page.