With iOS 11 and macOS 10.13 High Sierra, Apple no longer allows the use of two-step verification, its original and hastily built, somewhat creaky system for confirming a login. If you’re still using two-step, the moment you upgrade to iOS 11 or High Sierra, Apple will convert you to the newer two-factor authentication (2FA) method it introduced in September 2015. You don’t have to do anything but pay attention to how it works.
The best way for most people to protect an account from letting anyone who can obtain its password from being able to log in is to use 2FA. A factor is something that identifies you. A password is one kind of factor (something you know) and a token that’s sent to a phone or via SMS is another (something you have).
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