Pay Per Click ads are designed to allow website owners to pay a specified amount of money only when they receive a qualified click, or visitor to their website.

Pay Per Click agreements are provided by most large search engines these days, and allow the website owner to only pay for unique clicks to a specified website.

To maintain a successful Pay Per Click ad campaign, your conversion rate must be high enough to obtain a profit per individual click. The largest Pay Per Click search engines are Google and Overture.

Overture was the first Pay Per Click search engine to emerge back in 1997. They started out as a small company called GoTo.com and set the stage and business model that all other Pay Per Click ad companies follow to this day. GoTo.com has since changed its name to Overture at overture.com and is now fighting with Google Adwords for number one.