The Mechanism
First a brief glossary of terms:
Adwords: The program advertisers use to make their adverts.
Adsense: The program Website owners use to display the adverts
CTR: Click Through Rate (the number of page impressions the number of clicks on a advert)
The most effective methods of advertising on the internet are Google's Adwords program and Overture which is now officially called Yahoo Search Marketing but still universally known as Overture. This method of advertising is called Pay p.