Tuxedo describes a coat, not a breed: a bicolor cat, usually black and white, with a white chest 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, typically 6 to 14 pounds and living 12 to 18 years, though the pattern also appears in breeds such as the Maine Coon and Persian. Stories about tuxedos being smarter or bolder are fun but unproven. That long lifespan means a cat may share your home through several moves and life changes, so match the cat's age, energy and coat to your household rather than its markings.