A measurement of responses from a Web server to a page request from the user browser, which is filtered from robotic activity and error codes, and is recorded at a point as close as possible to opportunity to see the page by the user.

Actual placement of an ad in a document, as recorded by the ad server.

Purchase order between a seller of interactive advertising and a buyer (usually an advertiser or its agency)

Software tools which help the user find information of specific interest to him/her. The user‘s profile is continually refined and improved based on the user's acceptance or rejection of recommendations over time.

All forms of online, wireless and interactive television advertising, including banners, sponsorships, email, keyword searches, referrals, slotting fees, classified ads and interactive television commercials.