A skateboard is typically a specially designed plywood board combined with a quad wheeled, dual "truck" and quad bearing system designed for both movement and stunts, used primarily for the activity of skateboarding. The modern skateboard originated in California in the late 1950s. By the mid 1960s they were mass produced and sold throughout the United States.
A skateboard is propelled by pushing with one foot while the other remains on the board, by pumping in structures such as a pool or half pipe or by jumping off the board and pushing it. A skateboard can also be used by simply standing on the deck while on a downward slope and allowing gravity to propel the board and rider.
There is no governing body that declares any regulations on what constitutes a skateboard or the parts from which it is assembled. Historically, the design of the board has conformed both to contemporary trends and to the ever evolving array of stunts performed by riders/users, who require a certain functionality from the board. Of course, the board shape depends largely upon its desired function. Longboards are a type of skateboard with a longer wheelbase and larger and softer wheels.
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