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The following outline is provided as an overview of and topical guide to games and gaming: Games – structured or semi-structured activities, usually undertaken for enjoyment. They are usually fun activities that can be educational or purely just for fun. The term "game" is also used to describe simulation of various activities e.g., for the purposes of training, analysis or prediction, etc., see "Game (simulation)". Games are a universal part of the human experience, for all cultures, genders and ages. Key components of games are goals, rules, challenge, and interactivity. Games generally involve mental or physical stimulation, and sometimes both. Many games help develop practical skills, serve as a form of exercise, or otherwise perform an educational, simulational or psychological role.