Technical Implementation
Technically, ad rotation can be accomplished in multiple ways. The three most common approaches are server-side, client-side and service-based.
With server-side ad rotation, the ad is selected on the server and the corresponding HTML markup is generated and then served.
Client-side ad rotation typically involves JavaScript of some sort (either straight client-side JavaScript or else AJAX calls to the server.
Service-based ad rotation is similar to client-side ad rotation in that it typically involves placing a small amount of JavaScript in the web page, but the JavaScript calls against a third-party service that provides its own management interface for specifying ad delivery options. Google's AdSense service is an example of service-based ad rotation.
Read more about this topic: Ad Rotation
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“When you see something that is technically sweet, you go ahead and do it and you argue about what to do about it only after you have had your technical success. That is the way it was with the atomic bomb.”
—J. Robert Oppenheimer (1904–1967)