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Single sign-on (SSO) is an authentication scheme that allows a user to log in with a single ID to any of several related, yet independent, software systems. True single sign-on allows the user to log in once and access services without re-entering authentication factors.
In practice, modern secure systems often require a second factor such as email or SMS confirmation for extra security. Social login allows a user to use an existing cell phone number, or user credentials from another email or social networking service to sign in or create an account on a new website.