How are advertisements from third-party ad providers delivered to a web-page?
How does a third-party ad provider decide what ad to deliver to a web-page when it's loaded in a browser? And in what format is this data delivered? Let's say my web-page contains no ad-relevant or differentiating content, but I do know lots about my user: demographic profile, interests, browsing history etc. So the ad I want loaded must be user- (profile-) dependent, and not page specific. Is it possible, in an ad request from a browser to a third-party provider, to include profile data in the request in order to get an appropriate ad? If so in what format would this request likely be made,