A fantasy sport (also known as rotisserie, roto, or fairy-tale sport; or owner simulation) is a game where fantasy owners buil a team that competes against other fantasy owners based on the statistics generated by individual players or teams of a professional sport. Probably the most common variant converts statistical performance into points that are compiled and totaled according to a roster selected by a manager that makes up a fantasy team. These point systems are typically simple enough to be manually calculated by a "league commissioner." More complex variants use computer modeling of actual games based on statistical input generated by professional sports. In fantasy sports there is the ability to trade, cut, and sign players, like a real sports owner.