Tuxedo describes a coat, not a breed: a bicolor cat, usually black and white, with a white chest that looks like a shirtfront and often white paws, chin or a facial blaze. Grey-and-white tuxedos exist too. The pattern comes from white spotting variation in the KIT gene, and because it isn't sex-linked, males and females are about equally common.
Most tuxedos are domestic shorthairs, though the pattern also shows up in breeds like the Maine Coon, British Shorthair and Persian. Stories about tuxedos being especially smart or bold are fun but unproven, since color doesn't set personality. That means meeting the cat matters more than the markings: energy, age and coat length shape daily care, and a tuxedo can be a sofa napper or a shelf climber.