Single Sign-On or SSO is a method of authentication that uses a single login/password combination to authenticate multiple sites or “properties”. Some popular SSO examples include
SSOs are usually explained using the key (username/password) and lock (websites) analogy. With normal logins without SSOs, all the websites have different locks and different keys. With SSOs, every site has the same lock and one key can unlock everything.
SSOs have the advantage of only needing to remember one set of usernames and passwords.
While SSOs from large companies like Google, Facebook and Apple may be secure, but SSOs, if not designed with proper protections and security features, may allow for a higher chance of all your accounts becoming compromised.