What makes a Hero?

I don't think it is hard to become a hero. The common point about being a hero is that they all help people without asking any pay back from them. That means as long as you volunteer yourself for community service or whatever work, I think you can be considered as hero. The fictional heros I can think of are bat man, iron man, super man, spider man, and kick-ass. I don't see many heros in real life now, but I think some of the U.S presidents could be considered as hero, such as Abraham Lincoln and George Washington. I don't think it is necessary for heros to have super powers or agile body. A hero just needs to be unselfish and brave. Like Abraham Lincoln, he wasn't selfish, and he was brave enough to speak for the slaves. I don't really know about heros from various cultures, but I guess a particular American culture will be a guy with a cloak.