Hero shooters are games where you can play as one "Hero" in a group of anywhere between 8 and 30 (hero shooters don't really have a limit but 30 is a good estimate) diverse and specific characters each with different skills and abilities.
Hero shooters are typicaly played in first person or in some cases even third person, hero shooters are also always team games where you have the choice to play with friends or in a group with other people.
I enjoy them because of how diverse in style and playstyles of all the characters.