A game is a structured type of play usually undertaken for entertainment or fun, and sometimes used as an educational tool. Many games are also considered to be work (such as professional players of spectator sports or video games) or art (such as games involving an artistic layout such as mahjong, solitaire, or some video games).
There are many types of games; popular formats include board games, video games, online games, and card games. Games can be played in a variety of circumstances, and some can be played even without any materials or company. Games can be played either for enjoyment or for competition; they can be played alone or in teams; they can be played offline or online.