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Engine Traffic

"Product" engines let advertisers provide "feeds" of their product databases and when users search for a product, the links to the different advertisers for that particular product appear, giving more prominence to advertisers who pay more, but letting the user sort by price to see the lowest priced product and then click on it to buy. These engines are also called Product comparison engines or Price comparison engines.
Some Online Comparison Shopping engines such as Shopping.com use a PPC model

Keyword PPCs

Advertisers using these bid on "keywords", which can be words or phrases, and can include product model numbers. When a user searches for a particular word or phrase, the list of advertiser links appears in order of the amount bid. Keywords, also referred to as search terms, are the very heart of pay per click advertising. The terms are guarded as highly valued trade secrets by the advertisers, and many firms offer software or services to help advertisers develop keyword strategies. Content Match, will distribute the keyword ad to the search engine's partner sites and/or publishers that have distribution agreements with the search engine company.

PPC

PPC engines can be categorized into two major categories "Keyword" or sponsored match and "Content Match". Sponsored match displays your listing on the search engine itself whereas content match features ads on publisher sites and in newsletters and emails.
There are other types of PPC engines that deal with Products and/or services. Search engine companies may fall into more than one category. More models are continually evolving. Pay per click programs do not generate any revenue solely from traffic for sites that display the ads. Revenue is generated only when a user clicks on the ad itself.