OAuth

OAuth (short for Open Authorization) is a technological standard that allows you to authorize one app or service to sign in to another without divulging private information, such as passwords. If you’ve ever received a message such as, “Sign in with Facebook?” or “Allow this application to access your account?” you’ve seen OAuth in action.

OAuth uses access tokens to prove your identity and allow it to interact with another service on your behalf. In the event that this second service suffers a data breach, your credentials on the first service will remain safe.