What is a hero?

My definition of a hero is a selfless person who does acts of kindness and doesn’t think about how the act will affect his or her life. To me the term "hero" is overrated. A hero doesn’t have to be a strong muscular person that wears tight pantyhose and a cape. No, a hero can be brilliant doctor who finds a cure for cancer and saves hundreds of thousand lives, or a hero can be just a regular person who does something worthwhile for another. All heroes’ qualities are different. For example, a hero from a comic book, like Superman, can poses qualities that make them strong, supernatural, and bold. In the real world, heroes are kind, caring everyday people who care about the welfare of others. Has the definition hero changed over time? Yes. To every person hero has a different meaning, so I believe that the definition of hero changes with each person.