感动 (gǎn dòng) means 'to be moved emotionally' — it's the general word for feeling touched by something kind or sad. Unlike 感人 (gǎn rén), which is only an adjective describing something as 'touching', 感动 can also be a verb ('to move someone'). 激动 (jī dòng) means 'excited' or 'agitated', a different emotional state.