Binary space partitioning is a way for computers to divide or 'partition' 3D objects or scenes into smaller pieces to make it easier for a computer to understand and work with all the pieces together. It's kind of like dividing a pizza into slices - if you want to eat the whole pizza, it's easier to do so if it is divided up into pieces! Similarly, a computer can do more complicated things with 3D objects if they are first divided into smaller parts.