An RPG is a Role Playing Game.

This basically means that you create and control a character. Typically, RPGs are fantasy-themed, with swords and magic as your primary weapons. Good examples of this are the Final Fantasy series. Features of standard RPGs are random battles, experience points, mazes, bosses, item management, and saving the world.

Fable

Fable is an RPG for Xbox made by Lion head Studios and Big Blue Box. It has an exciting and complex storyline, many unlockable magic powers, weapons and armor shown cosmetically on your character, and a simple but challenging battle system. It has a large world that is brought to life with many NPCs (Non-Player Characters) that exhibit realistic emotions and react to your player.