Albert Barnes Commentary Daniel 8:15

"And it came to pass, when I, even I Daniel, had seen the vision, that I sought to understand it; and, behold, there stood before me as the appearance of a man." — Daniel 8:15 (ASV)

And it came to pass ... — Daniel saw the vision, but was unable to explain it.

And sought for the meaning — Evidently by meditating on it, or endeavoring in his own mind to make it out.

There stood before me as the appearance of a man — One having the appearance of a man. This was evidently Gabriel (Daniel 8:16), who now assumed a human form, and who was addressed by the voice from between the banks of the Ulai, and commenced to make known the meaning of the vision.