Pay per click (PPC) is an advertising program that used on search engines, advertising networks, and sites/blogs. The advertiser will pay the publisher when a user clicks on an link of ad to visit the advertisers website. Before that the advertiser must bid on keywords of their websites content. The advertiser try to choose right keywords to promote their website. So, when a user types a keyword that matching the advertisers keyword list via search engines, the advertisers ad will appear on search result. And then user can click on link of ad.
The publisher can join this advertising program and place ad scripts into their sites or blogs. The ad will appear on sites or blogs that relevant with content.
There are many pay per click advertising program on the internet, like Google AdSense, Bidvertiser, Adbrite, Yahoo Publisher etc. Google AdSense is the most popular pay per click advertising program.
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