A direct, local connection, not an upload
AirDrop transfers files directly between the two devices over a local Wi-Fi and Bluetooth connection rather than uploading anything to the internet, which is why it works even without a cellular or Wi-Fi network connection and why it is so fast for large files like photos and videos.
Visibility settings exist for privacy, not just convenience
Setting AirDrop visibility to "Contacts Only" instead of "Everyone" prevents strangers nearby from being able to send you unwanted files or see your device listed at all, which matters in crowded public places.
Frequently Asked Questions
The recipient's device is not showing up nearby -- what should I check?
The recipient may have their AirDrop receiving set to "Receiving Off," or their screen may be locked -- ask them to unlock their screen and check their AirDrop setting.
Can I use AirDrop with an Android device?
No -- AirDrop only works between Apple devices, such as iPhone, iPad, and Mac.