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A role-playing game (RPG and sometimes roleplaying game) is a game in which players assume the roles of characters in a fictional setting. Players take responsibility for acting out these roles within a narrative, either through literal acting or through a process of structured decision-making or character development. Actions taken within many games succeed or fail according to a formal system of rules and guidelines.

There are several forms of RPG. The original form, sometimes called the tabletop RPG, is conducted through discussion, whereas inlive action role-playing games (LARP) players physically perform their characters actions. In both of these forms, an arranger called a game master (GM) usually decides on the rules and setting to be used, acting as referee, while each of the other players plays the role of a single character.

Several varieties of RPG also exist in electronic media, such as multi-player text-based MUDs and their graphics-based successors,massively multiplayer online role-playing games (MMORPGs). Role-playing games also include single-player role-playing video games in which players control a character or team who undertake quests, and may include capabilities that advance using statistical mechanics. These games often share settings and rules with tabletop RPGs, but emphasize character advancement more than collaborative storytelling.

Despite this variety of forms, some game forms such as trading card games and wargames that are related to role-playing games may not be included. Role-playing activity may sometimes be present in such games, but it is not the primary focus. The term is also sometimes used to describe roleplay simulation games and exercises used in teaching, training, and academic research.

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Both authors and major publishers of tabletop role-playing games consider them to be a form of interactive and collaborative storytelling.  Events, characters, and narrative structure give a sense of a narrative experience, and the game need not have a strongly-defined storyline. Interactivity is the crucial difference between role-playing games and traditional fiction. Whereas a viewer of a television show is a passive observer, a player in a role-playing game makes choices that affect the story. Such role-playing games extend an older tradition of storytelling games where a small party of friends collaborate to create a story.

While simple forms of role-playing exist in traditional children's games of make believe, role-playing games add a level of sophistication and persistence to this basic idea with additions such as game facilitators and rules of interaction. Participants in a role-playing game will generate specific characters and an ongoing plot. A consistent system of rules and a more or less realistic campaign setting in games aids suspension of disbelief. The level of realism in games ranges from just enough internal consistency to set up abelievable story or credible challenge up to full-blown simulations of real-world processes.

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Role-playing games are played in a wide variety of formats ranging from discussing character interaction in tabletop form to physically acting out characters in LARP to playing characters virtually in digital media. There is also a great variety of systems of rules and game settings. Games that emphasize plot and character interaction over game mechanics and combat sometimes prefer the name storytelling game. These types of games tend to minimize or altogether eliminate the use of dice or other randomizing elements. Some games are played with characters created before the game by the GM, rather than those created by the players. This type of game is typically played at gaming conventions, or in standalone games that do not form part of a campaign.