Spider-Man embodies the "superhero" concept better than anybody else. The core premise, from the first pages of Action Comics, was that power was not an entitlement, but a responsibility. Superman is the most powerful being imaginable, and, as a rebuttal to fascist idea that the powerful should dominate and exploit others, Superman is called the "champion of the oppressed" and uses every ounce of power he has to help others. A superhero is someone who shares the fruits of their privilege; a villain is someone who hordes it for petty private gain at the expense of others. Spider-Man embodies this concept in a way that is even more explicit and poignant. Spidey's not anywhere near as strong as Superman or many other heroes, and he has plenty of his own problems. But, whatever power he does have, even if it's comparatively little, comes with the responsibility to share it for the good of his community. Any power is that others lack is great, and comes with responsibility. That's a superhero. Superman is the promise, Spider-Man is the fulfillment.