Medicare is a federal health insurance program in the United States that provides coverage for individuals aged 65 and older, as well as certain younger individuals with disabilities or end-stage renal disease. Administered by the Centers for Medicare & Medicaid Services (CMS), Medicare consists of different parts that cover specific healthcare services. Medicare Part A covers hospital stays, skilled nursing care, hospice care, and some home health services. Medicare Part B covers doctor visits, outpatient care, preventive services, and medical supplies. Medicare Part D offers prescription drug coverage, while Medicare Part C, also known as Medicare Advantage, allows beneficiaries to receive their Medicare benefits through private insurance plans. Medicare plays a critical role in ensuring access to healthcare for older adults and individuals with disabilities, providing comprehensive coverage options to meet their healthcare needs.