"Photographs do not explain, they acknowledge." Insight Please?

Question:

"Photographs do not explain, they acknowledge." Insight Please?

What does the aforementioned quote by Susan Sontag mean and in depth please explain your reasoning.

I appreciate your insight and look forward to your response.

Best Answer - Chosen by Asker:

A photograph is merely an image left to the mind to interpret. While the photographer might emphasise certain aspects of their subject through compositioin and lighting, explanation requires words... either the photographer's or the observers'.