AirTag is a location-based tracking device developed by Apple Inc. It can be used to track and locate personal items such as keys, wallets, and bags. AirTag uses Apple's Find My network to communicate with Apple devices and can be used with iPhones, iPads, and iPod touch running iOS 14.5 or later. It can also be used with Macs running macOS 11.3 or later. Additionally, AirTag is compatible with Apple Watch Series 3 or later running watchOS 7.4 or later. However, it's important to note that the AirTag requires an Apple ID and iCloud account.