Apple AirTag (not AirTags) are cool new devices that you attach to an important item. Now, if you ever misplace that item, you can track it down via the FindMy app on your iPhone if it is nearby.  If you lose that important item, you use FindMy to ping AirTag to see where it is on a map, even if you are nowhere close to the AirTag - which is made possible through encrypted information shared from your AirTag, connecting to other people's iPhones who may have passed by the item recently.