In Google Analytics, a session describes a unique visit to a web domain. This could be a hundred different users, or the same user a hundred times. A new session is started when a user comes to a domain through a unique means. For instance, a user comes to a domain from an organic search and immediately leaves. Then the user clicks an ad which returns to the domain. In this event the user created two unique sessions. Sessions last until the session timeout is reached, or a new session is started. View our article on session time tracking for more information. Also view other metrics in Google Analytics in our list here.