Single sign-on (SSO) is a property of access control of multiple related, but independent software systems. With SSO, a user logs in once and gains access to all systems without being prompted to log in again at each of them. Using SSO, users and administrators can manage access to multiple systems from a single point of authentication. SSO is used mainly by organizations to provide access to their websites and applications for their employees. It is also used to provide access to websites for users with multiple accounts. SSO does not only simplify the user sign-in process, but also provides better security for user accounts since only one set of credentials needs to be protected. Additionally, because only one sign-in is required, SSO eliminates the need for users to remember individual usernames and passwords for each account.