Trivia apps are mobile or web-based applications that provide users with a wide range of general knowledge questions and answers on various topics. Users can play alone or with others and can choose from a variety of categories, such as history, science, sports, entertainment, and more. Trivia apps can be in the form of single-player games, multiplayer games, or live trivia events. Some trivia apps offer rewards or prizes for winners or high scorers. Examples of popular trivia apps include HQ Trivia, Trivia Crack, and QuizUp.