Single Sign-On (SSO) is a technology that allows an access to multiple independent software systems with a single credentials set.

Single sign on is a session/user authentication process that allows a user to provide his or her credentials once in order to access multiple applications. The single sign on authenticates the user to access all the applications he or she has been authorized to access. It eliminates future authenticaton requests when the user switches applications during that particular session.

A user logs in once and gains access to all systems without being prompted to log in again at each of them.