The direct translation of heroism is "great bravery". Yet, you don't need to be brave to be considered a hero. An action of heroism can vary from saving multiple people from a fire to giving a student a spare pencil before an important test. There are so many people who are recognized as heroes; George Washington, Martin Luther King Jr., and Mahatma Gandhi. There are also so many heros who aren't recognized. I always take the time to appreciate the little things that normal people do to make the world a better place, like picking up trash.
This video is actually an insurance commercial but it has a very good example of what I think of heroism. WARNING: YOU MAY CRY!