Final answer:
Medicaid is a joint federal and state program that provides medical insurance for low-income people, including low-income families with children, the low-income elderly, and people with disabilities.
Step-by-step explanation:
Medicaid is the joint federal and state program enacted in 1965 that helps with medical costs for certain low-income people. It provides medical insurance for low-income families with children, the low-income elderly, and people with disabilities. Medicaid is different from Medicare, CHIC, and TRICARE as it specifically targets individuals with low incomes.