In Dungeons & Dragons, 3rd Edition, the Sorcerer is a new character class. The only 3e class actually new to the game as a whole, the sorcerer has much in common with the wizard. The two classes draw upon the same list of spells, and have similar lousy combat skills. However, where the wizard can learn any spell he likes, the sorcerer is stuck with a certain set of spells embedded in his mind, which he can extend over time, but never alter once set. Why take such a restriction? Because sorcerers can cast more spells a day than a wizard, and choose what spell to cast on the spur of the moment. The only restriction on this skill is that the spells slots are graded according to level, and if you spent your 3rd level slot already today, there's no fireball this evening.