A skateboard is a four wheel mode of transportation made of multiple components. It has a wooden deck with grip tape applied to the top for better traction. This deck is mounted to two trucks. Trucks are the turning mechanisms of the skateboard that allow the skater to lean on one side of the deck or the other to turn the skateboard. Bearings are installed into the wheels, which are then applied to the trucks. This allows the skateboard to roll across the ground as it is pushed by the rider. Skateboards are ridden by people of various ages. Skateboarding is done by pushing the board with one foot while keeping the other on the board. Skateboarding is a sport but is also used as a mode of transportation. People who carry out the various skateboarding activities are known as skateboarders or skaters.