This is the name for the federal program and corresponding state programs that pick up healthcare costs for indigent children and adults. Unless you’re below the poverty line or you spend out your assets in your senior years, this won’t be part of the discussion.
There is one benefit Medicaid offers that might tempt people to wonder about trying to qualify for Medicaid. That benefit is long term care. The downsides though are sufficiently scary for most people so as to dissuade them from attempting this.