It's the interaction a user, such as yourself, has with a Web site. The period of time you interact with a Web site. A specific individual who visits a Web site. Unique users can only be recognized through some form of user registration or identification system. Elements can include text, images or media objects such as RealAudio player files, QuickTime videos or Java applets.
Pages can be static or dynamically generated.
The number of times an ad was seen. The number of times an ad is delivered from the ad server. The number of times you click on an ad that typically leads to an advertiser's Web site. This is the storage of recently-viewed pages on a user's disk to speed browsing. When you revisit a page, your browser displays pages from your disk instead of requesting them again from a site's Web server.