'Son of Man' in the Bible

I saw in the night-visions, and, behold, there came with the clouds of heaven one like unto 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 affrighted, and fell upon my face: but he said unto me, Understand, O son of man; for the vision belongeth to the time of the end.