AirDrop is feature that lets you transfer files between two Bluetooth enabled Apple devices. To work, both devices need to have bluetooth enabled. You can choose to be invisible, be visible to only your contacts, or be visible to everyone. Because it’s bluetooth, there are usually not that many people around. Once you see the person you want to transfer a file too, you just drag it on their other persons icon. When you receive a file, you get a notification. You can choose whether or not to accept. 

For one of the challenges in this class, my partner and I used airdrop to transfer files. It’s both faster and easier than emailing.