How does AirDrop work? I thought it is just Bluetooth, but I am starting to doubt that now.
Whenever I turn AirDrop on, my Wi-Fi and Bluetooth are automatically turned on. If I turn the Wi-Fi off, and try to AirDrop, sometimes it works, but sometimes it doesn't. It never works if I turn the Bluetooth off instead.
So... Why does this happen? How does AirDrop work?