An access management system, usually distributed over a network, which allows users to sign on once and gain entry to multiple applications and network sessions. This works to alleviate the problems of frequent password reset requests from users who have difficulty remembering several passwords.
comfortable form of authentication of a user against a complex system with many subsystems: a single authentication action against the system (usually via a dedicated authentication server) leads to an authentication that is valid for all subsystems to which access is necessary in a certain role and situation
A authentication mechanism that enables a user to log in once and then access multiple applications. These applications form a circle of trust that use each other's cookies as verification of authority so that the user does not have to login to each application separately.