There’s lots of interest in Apple’s new Sign In with Apple system, a highly secure, private way to sign in to apps and websites. Here’s what you need to know:
What is Sign In with Apple?
Apple has noticed that sign-in systems for services, apps, and websites rely on services that use your action of signing in to place cookies on your computer and track what you do.
Apple’s focus on privacy means it is attempting to restrict such practices, which is why it has developed the new system as a more private way to sign into these apps and services.
from Computerworld http://bit.ly/317Q786