Emo is usually known as a style of music whereas the lyrics deal with emotion, which emo is short for emotional. Emos tend to wear black and have hair that is cut in a way so that it covers the eyes a bit. There is also gothic, which they can sometimes be confused with emo, but I am more on the emo side. Check out this for more info between goth and emos which also gives you insight on what an emo is: https://www.quora.com/Whats-the-difference-between-goth-and-emo