A monoski is the main piece of equipment used in monoskiing, a form of skiing. It is similar to a snowboard or skwal in that both feet are attached to the same board. On a monoski, the feet are side-by-side and pointing in the direction of the board, and standard ski bindings are used (rather than non-releasing bindings like on snowboards and skwals). Unlike snowboarding, ski poles are used when monoskiing.
Monoskiing was invented in the 1980s, several years before snowboarding. After an initial period of relative popularity in the late 1980s interest in monoskiing waned in favour of snowboarding, though monoskiing is still practised by a reasonably large enthusiast community.