[fatum]

I understand that に signifies direction and location. However, there's one phrase that I don't really understand:

このサイトについて

Intended translation being:
"About this site."

Why is the に particle used in this situation?

I've memorized the phrase as I understand all of the words that make up the phrase. I've noticed the に particle used in this situation with other locations as well, for example: Googleについて.