Why use a Matrix?

Hello everyone! I have been studying matrix’s for a couple of hours now, and I have seen people say how useful it is and it makes things so much easier for them in game development, but I cannot see a reason to use one. The only real reason would be for an inventory system, but how would I use them in other ways outside of just an inventory system. Thanks.

You can use matrixes in many ways and one of the ways that I’ve done so in the past is by using it in a chess board to describe the board state, what squares are active and where pieces are. You can also make more abstract things with such ideas where it may not seem obvious until you look into it, like plot systems.