A word that has recently been overused in the American English vocabulary. It has been automatically bestowed upon people in the law enforcement, armed forces, or fire/rescue services, as well as presidents. I.e. police officers, soldiers, and fire fighters and paramedics. A hero, however, does not require wearing a uniform or be involved in such professions listed above.
The basic definition of a hero is one who does not recognize such declarations bestowed upon them by others and accomplishes an act or acts which are deemed extraordinary and exceeds the call of duty. This act or acts usually involves the intention or consequence of saving another person(s) life or rescuing another from impending harm.
It's not your average superhero movie--the characters aren't a small group of people that "nobody understands" and try to save the world in fancy costumes. Watch it, and you'll see why everybody's crazy about it.
"Those who face fire without fear or armor.Those who step into the darkness without assurances of ever walking out again, because they know there are others waiting in the dark, Awaiting salvation."