Microchips are a small implant that are inserted right under the skin of the kitty. Each microchip has an individual identification number. The chip can be scanned by a microchip scanner in the event that a cat is lost or stolen. The microchip is registered online with owner information. So, if the kitty is found, the kitty and owner can be reunited quickly. 🙂 The microchip does not work as a tracking device.