Find My iPhone is a popular feature provided by Apple that allows users to locate their lost or stolen iPhone. It uses the device's built-in GPS and internet connection to pinpoint its exact location on a map. In addition to locating the device, Find My iPhone also offers several other useful features. Users can remotely lock their device, display a custom message on the screen, play a sound to help locate it, or even erase all the data on the device to prevent unauthorized access. This feature has gained immense popularity among iPhone users as it provides peace of mind and increases the chances of recovering a lost or stolen device.