Another measurement for website traffic. A single user session runs from when a user first goes to a website until they leave. Although still not completely accurate, user sessions are more accurate than page impressions for judging the number of visitors to a website.
From the moment a single visitor logs onto (enters) a web site until logging off (exiting) is considered a user session. During a session, the visitor will typically view several web pages. On SiteNet, visitors spend an average of nine minutes during each user session.
The number of people who visit a Web site. This can be referred to as either "Unique User Sessions" which eliminates duplication for people who are frequent visitors to the site.