Health insurance exchanges are online Marketplaces that were set up by the Affordable Care Act (ACA) for consumers to buy affordable health insurance in an organized and simplified way. You can view and compare multiple certified health plans, and you’re given educational tools to help you understand your options. Marketplaces can also tell you whether you’re eligible for Medicaid or tax subsidies based on your income. You can access most Marketplaces via websites or call centers.