What is your definition of hero

My definition of hero is alot of things like Superman he's a hero but he is made up.But a police officer, firefighter, and the paramedics are heros saving lives, and keeping people from danger. The characteristics of what does the hero do is not that hard I can be a hero for example, I can save a cat out of the tree, and take a dog out the middle of the street from getting hit. Superman fight bad guys in fact all superheros fight bad guys even the police.The definition of hero change over time like Spiderman he didnt want to be a hero no more so, just because a hero save people dont mean he's good.Even some police are bad, California have some bad police everywhere in fact.So that's my definition, qualities, and the change they have in their life of a hero.