This chapter discusses various elements of game development including non-entertainment applications of games, available platforms, time intervals, player modes, and popular genres. It addresses platforms such as consoles, computers, online/multiplayer, handhelds and tabletop. Time intervals can be real-time, turn-based or time-limited. Player modes include single player, local and online multiplayer. Popular genres are discussed like action, racing, fighting, simulation, strategy, role-playing, music and more.