This is the 511th most frequent Japanese word.
感動
Deep emotional impact or being emotionally moved.
感動 here describes the emotional response of being deeply moved by something heartwarming or inspiring.
あの映画は本当に感動しました。
That movie truly moved me.
感動的 is derived from 感動 and means 'moving' or 'touching,' used here to qualify the speech.
彼の感動的なスピーチに涙を流しました。
I shed tears at his touching speech.
感動 is used here in the context of describing an overwhelming emotional experience of being deeply touched.