Role-playing
In role-playing, participants adopt characters, or parts, that have personalities, motivations, and backgrounds different from their own. Role-playing is like being in an improvisational drama or free-form theatre, in which the participants are the actors who are playing parts.
Therapy
Role-play is often used as a tool by mental health professionals, teachers, and trainers as a way to explore social situations and work through the possible actions and consequences.
For example, Peace Corps trainers use role-playing to prepare volunteers for entry into an unfamiliar culture. For another, marriage counselors may ask a husband and a wife to play the part of each other in a communication exercise.
Games
A role-playing game is a type of game where players role-play by assuming the role of a character in a fictional world. These are often paper and pencil games like Dungeons & Dragons, computer games like Final Fantasy, or massively multi-player online role-playing games (MMORPGs) like EverQuest and Ultima Online. An emergent form of the RPG is the live action role-playing game, where participants act out their characters' actions, often using elaborate costumes, fake weaponry and other props. (See the gamemaster article for an example of role-playing within a paper and pencil game).
Sex
Sexual role-play is a form of role-play in which partners take parts in a drama that provides sexual gratification; these might include a teacher and pupil, employer and maid, or parent and child. Sexual role-play is common in BDSM.
Note that confusion can occur in translations between English and French, where the name "jeux de role" is applied both to game and psychodrama.