A "blood thinner" is a medication that helps prevent blood clots from forming or growing larger. These medications are often prescribed to individuals at risk of conditions like deep vein thrombosis or stroke. They work by affecting the blood's ability to clot, making it less likely for clots to obstruct blood flow. There are two main types of blood thinners: anticoagulants and antiplatelet agents. Anticoagulants, such as warfarin and heparin, interfere with the proteins in blood that help it clot. Antiplatelet agents, like aspirin, prevent platelets from sticking together. Both types are crucial in managing cardiovascular health.