'Son of Man' in the Bible

I saw in the night visions, and, behold, there came with the clouds of heaven [somebody] like a son of man. And he came even to the ancient of days, and they brought him near before him.

So he came near where I stood. And when he came, I was frightened, and fell upon my face. But he said to me, Understand, O son of man, for the vision belongs to the time of the end.