A vision processing unit (VPU) is like a tiny computer that helps machines “see” like people do. A VPU takes inputs from a camera (like from a surveillance camera), processes that information, and then gives commands to other machines to do things, like turn on an alarm if it sees something it is supposed to detect. The VPU can be programmed to recognize specific objects and then decide when to take action. Think of it like a tiny brain that helps machines “see” what is happening around them.