Republicans are eyeing cuts to Medicaid. What is Medicaid, and how is it different from Medicare?

In January, during a congressional hearing on his way to becoming secretary of the Department of Health and Human Services, Robert F. Kennedy Jr. got basic details wrong about Medicaid — a program he now oversees.

He said that Medicaid is fully funded by the federal government (it's not) and that many enrollees are unsatisfied with high out-of-pocket costs (enrollees pay limited, if any, out-of-pocket costs).

Medicaid is complex. The $880 billion-a-year state-federal program offers health coverage to millions of disabled and low-income Americans. The program covers different services for different people in different parts of the country — and enrollees may interact with private insurance companies without "Medicaid" in their names, leaving some unaware that they're on the program at all.