Not all superheroes have super powers however, some are just incredibly athletic or intelligent, or just well trained in the martial arts. Take Batman for example. He's a superhero with no super powers whatsoever. Still, he's considered one of the most famous superheroes.
Most superheroes wore special costumes. They usually have capes, cloaks, masks and other elements in their costumes. Superman, Batman, Green Lantern and Wonder Woman are among the most famous superheroes.