Gamification

“Gamification is a business strategy which applies game design techniques to non-game experiences to drive user behavior.” - http://gamification.org/

“Some common techniques have been applied to gamification projects, such as: achievements / badges, levels, leaderboards, progress bars, activity feeds, avatars, real-time feedback, virtual currency, gifting, challenges and quests, and trophy case.” - http://gamification.org/wiki/Gamification#Techniques