Both Social Security Disability (SSD) and Supplemental Security Income (SSI) are disability programs administered by the Social Security Administration (SSA).  SSD (also known as “DIB” or “Title II”) is a benefit for those who had a relatively steady work history for a period of time prior to becoming disabled.  SSI (also known as “Title XVI”) is a benefit for those who may have only worked for a brief period of time – or not worked at all – prior to becoming disabled.  To be eligible for SSI, you must meet a financial need criteria similar to the financial guidelines for Public Assistance (welfare).