What's the difference between goth and Emo? I've allways learned goth and Emo are the exact same thing- just what time era they were used, and just recently told there's a difference- but what?

Goth is all dark usually and Emo is short for emotional.

They both dress different, look different almost, listen to different music, plus Goth is people who dress dark mostly, and Emo stands for 'emotional'. Can you kinda see the difference? Sorry if it didn't make sense, I tried to.