A game "turn" is an important fundamental concept to almost all non-computer games, and many video games as well (although in video games, various "real-time" genres have become much more popular). In general, a turn is a segment of the game set aside for certain actions to happen before moving on to the next turn, where the sequence of events can largely repeat. In a truly abstract game ("backgammon") turns are nothing more than a means to regulate play. In less abstract games ("Risk"), turns obviously denote the passage of time, but the amount of time is not clear, nor important. In simulation games, time is generally more concrete. Wargames usually specify the amount of time each turn represents, and in sports games a turn is usually distinctly one 'play', although the amount of time a play or turn takes can vary.