For the uninitiated, a role-playing game or RPG is a game where a player often uses dice to help determine the statistics for a character they want to emulate. Play is done in a group headed by the Game Master, who controls the story and presents the players with challenges they need to overcome.
A discussion on a Facebook roleplaying group got me thinking about all the games and RPGs that I've played over the years... so just for fun, here's a list (that's not necessarily comprehensive).
Dungeons and Dragons (multiple editions)
Vampire The Masquerade
Mutants and Masterminds
Marvel Universe RPG
Big Eyes Small Mouth
Sailor Moon RPG
Doctor Who RPG
I've been gaming since I was a teenager, and now I'm teaching our daughter the basics of Dungeons and Dragons. Fun times.