A speeder is a type of vehicle that is designed for high-speed travel on land, air or water. It can refer to any vehicle capable of reaching and maintaining high speeds, such as cars, motorcycles, boats, planes, trains or other modes of transportation. The term "speeder" is often used in a more specific context to describe certain types of vehicles that are known for their speed, such as police cars (also called "speeders") which are designed to respond quickly to emergencies and travel at high speeds to reach the scene.