Apple AirTags are Bluetooth Low Energy (BLE) devices that use the vast network of iPhones to report data back to the cloud-based, Apple 'Find My' Network. iPhones running iOS 14.5 or later include features that help detect when other people's AirTags are traveling with you. This feature helps discourage AirTags from being used maliciously to stalk people. Folks that use Android phones don't have any of these AirTag features, leaving them vulnerable to 'AirTag Stalking'.
This app gives you the ability to run a bluetooth scan to determine if there are any AirTags in your immediate vicinity.
Be safe out there, folks!