Windsurfing is a surface water sport that combines elements of surfing and sailing. It consists of a windsurf board usually two to four meters long, powered by the effect of the wind on a sail. The rig is connected to the board by a free-rotating universal joint and comprises a mast, wishbone boom and sail.
In fact windsurfing can be said to straddle both the laid-back culture of surf sports and the more rules-based environment of sailing. Although it might be considered a minimalistic version of a sailboat, a windsurfer offers experiences that are outside the scope of any other sailing craft design.
Windsurfers can perform jumps, inverted loops, spinning maneuvers, and other “freestyle” moves that cannot be matched by any sailboat. (more on Wikipedia)