Share Passwords Between Your Devices
AirDrop also has a passive feature that will automatically share passwords, particularly Wi-Fi passwords, among your devices. Turn AirDrop on, and make sure you are signed into the same iCloud account for all your devices. When you enter a Wi-Fi password on one device, it will be shared to your other devices as well. It’s handy when accessing guest Wi-Fi (please don’t use Wi-Fi networks without a password).