What is the real meaning of the so-called "hero"?

Hero (English name is Hero) refers to people who make great sacrifices for the country, people and society or benefit the people, such as Superman, Spider-Man and Batman in the United States. They are all superheroes and idols in the hearts of the people, because they are all defending the city and completely eliminating crime. There is also a hero who has made great efforts to reverse Gan Kun in the war. Such heroes are called war heroes, and some heroes have sacrificed for the people and have been recognized by some collectives and society. They are heroes of their relatives at home, because they have worked hard for their families, even if they are lucky in their jobs. Bitter, they will always be the biggest heroes in the family. There is no concrete difference between ordinary people, noble people and humble people. They can also be heroes. Real heroes have no boundaries.