The Holographic Principle, Black Hole Entropy and AdS/CFT

HN commenters point to it as an accessible way to get a grip on AdS/CFT and the holographic principle whenever black holes or information physics come up.

A PBS Space Time episode explaining the holographic principle: the idea that our 3+1 dimensional universe may be described by information on a lower-dimensional boundary. It walks through black hole entropy and the AdS/CFT correspondence.