Two-factor authentication with Apple ID
Apple ID has included 2FA (Two-factor authentication) on macOS and iOS devices for some time and it is strongly advised you use it. Thanks to Apple using 2FA across all of your devices it is very easy and makes accessing Apple’s Cloud Services very secure such as iCloud Drive, you will now need more than just the email address and password you use for your Apple ID. You will also need to have a trusted device in hand or alternatively have a verification code sent via SMS or phone call...