Mahjong is a four player game that uses tiles. It's a game of skill and strategy.
Originally from China, the game Mahjong involves the use of tiles with symbols and numbers on them to create hands. The game is most commonly likened to poker, in that players gain and lose points, while trying to assemble hands with objects like "straights," "pairs," and "flushes."
However, the actual play of the game is wildly varied based on location, as the playing styles of various countries is very different.