Medicare is a  health insurance program in the United States, primarily designed for individuals aged 65 and older. It also covers certain younger people with disabilities and those with specific health conditions, such as End-Stage Renal Disease (ESRD) or Amyotrophic Lateral Sclerosis (ALS).

Medicare has several parts:

1. Part A (Hospital Insurance): Covers inpatient hospital stays, skilled nursing facility care, hospice care, and some home health care.

2. Part B (Medical Insurance): Covers outpatient care, doctor visits, preventive services, and some medical supplies.

3. Part C (Medicare Advantage): A private insurance plan that includes coverage from both Part A and Part B, often with additional benefits.

4. Part D (Prescription Drug Coverage): Offers prescription drug coverage through private insurance companies.

Medicare aims to provide affordable healthcare to eligible individuals, ensuring they have access to necessary medical services while minimizing out-of-pocket costs.