A mind palace aka. method of loci according to Wikipedia is “a method of memory enhancement which uses visualization to organize and recall information” used by the ancient Greeks and Romans. It’s a technique that uses regions of the brain involved in spatial learning.
I got this idea from the BBC’s popular television series Sherlock, a show I highly recommend if you have not seen it. Sherlock uses his mind palace to store massive amounts of information that he uses to solve crimes/mysteries.
I use this concept liberally as I am not so much interested in storing massive amounts of information. As a highly visually-minded person I uses pictures, colors, spaces, and locations to organize and recall information about myself and the world. That’s where the idea of “My Mind Palace” comes from.