The Health Insurance Marketplace, also known as the Health Insurance Exchange, is a platform established under the Affordable Care Act (ACA) where individuals and families can compare and purchase health insurance plans. It provides a centralized marketplace where consumers can shop for coverage options, compare prices and benefits, and determine if they qualify for financial assistance such as premium tax credits or cost-sharing reductions. The Marketplace offers a range of plans from private insurance companies that meet certain standards set by the ACA, ensuring coverage for essential health benefits and prohibiting discrimination based on pre-existing conditions. Open enrollment periods allow individuals to sign up for coverage or make changes to their existing plans, providing access to affordable and comprehensive health insurance options.