Medicare is a federal health insurance program established in 1965 under the Social Security Act. Its primary purpose is to provide healthcare coverage to:

Individuals aged 65 or older.
Younger people with certain disabilities.
Individuals with End-Stage Renal Disease (ESRD).

Medicare is composed of different parts, each designed to cover specific healthcare services:

Part A (Hospital Insurance): Covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care.
Part B (Medical Insurance): Covers outpatient care, doctor visits, preventive services, and medical supplies.
Part C (Medicare Advantage): An alternative to Original Medicare offered by private insurers.
Part D (Prescription Drug Coverage): Covers prescription medications.