Most people are familiar with the term roleplaying.
Most people do not know about roll-playing though. It was used insultingly against people who did not really care about playing a role in the game, and just cared about the numbers on their sheet, about winning, about slaughtering the most things, about rolling the highest, or other such action-oriented goals. Thus, the games are split as well into the roleplayers, and the roll-players. Dawn's Rising and Novus Opiate Seclorum. Both privately owned and free, using the same game engine.