SSO is an authentication technique that enables users to register into numerous websites or services using a unique piece of registration information. The amount of times a person must check in and the number of credentials they must recall are reduced when SSO is used. SSO is frequently used in conjunction with two-factor authentication or multi-factor authentication (MFA) to boost the security of the single set of passwords.

Software and online app developers have the option to incorporate support for an SSO technique into their creations. SSO services from Google, Apple, and Facebook all let users join in to new apps or websites without having to create distinct accounts for them. Other businesses offer SSO goods catered to the more demanding requirements of big organizations.

The sites must all accept a single identification supplier in order to use SSO. The sign-on procedure is passed to the identity supplier when a user first enters into one of the services. The identity provider generates an identification token establishing the user's credentials after the user logs in with their login and password and saves that token in the user's web browser or the identity provider's computer. The service examines the identifier (in the web browser or on the identity provider's computer) when the user attempts to contact another service that utilizes the same SSO technique, and if successful, gives entry to the user.