Medicaid in the United States is a joint federal & state funded program. It's a means tested program, which is managed by the states. Currently, each state has broad leeway in determining the eligibility for the implementation of the program.
The Health Insurance Association of America describes Medicaid as a "government insurance program for individuals of all ages whose income & resources are insufficient to pay for health care."
With over 74+ million low-income & disabled participants, Medicaid is the largest source of funding for medical & health related services. Medicaid recipients MUST be U.S. citizens or legal permanent residents. Participants may include low-income adults, their children & individuals with specific disabilities. Poverty alone does NOT necessarily qualify an individual for Medicaid.
Medicaid offers benefits that are not normally covered by Medicare. A couple examples of added benefits are nursing home care & personal care services.