SLED is a type of vehicle that is used for recreational activities in the winter. It is a four-wheeled vehicle with a flat bottom and two handles on the back. The term SLED can refer to several different types of vehicles, including PUNG (a four-wheeled vehicle with a curved bottom), COASTER (a seven-wheeled vehicle with a flat bottom), SLEDGE (a six-wheeled vehicle with a flat bottom), LUGE (a four-wheeled vehicle with a curved bottom), SLEIGH (a six-wheeled vehicle with a flat bottom), TOBOGGAN (an eight-wheeled vehicle with a flat bottom), and RUNNER (a six-wheeled vehicle with a flat bottom). All of these vehicles are designed to be pulled by a person or animal, and they are used for recreational activities such as sledding, skiing, and snowboarding.