Click Stream

"A virtual trail that a user leaves behind while surfing the Internet. A clickstream is a record of a user's activity on the Internet, including every Web site and every page of every Web site that the user visits, how long the user was on a page or site, in what order the pages were visited, any newsgroups that the user participates in and even the e-mail addresses of mail that the user sends and receives. Both ISPs and individual Web sites are capable of tracking a user's clickstream.

Clickstream data is becoming increasingly valuable to Internet marketers and advertisers."

Source:
Clickstream. Webopedia.com. Retrieved May 12, 2008 on the World Wide Web at: http://isp.webopedia.com/TERM/C/clickstream.html