감정 is a noun and it means emotion. 감동 is a form of noun of "being moved or being touched". and 감동하다 is a verb and it means 'be touched or be moved'. For example, the following words like happy, pleasant, furious, and mad are the words indicate 감정(emotion or feelings). and you can say with 감동 / 감동하다 like this. 1) I was moved by the beautiful story. 나는 그 아름다운 이야기에 감동했다. 2) That story is really touching. 그 이야기는 정말 감동이다. 3) That is really toucing story. 그것은 정말 감동적인 이야기이다. I hope it helps! :)