PPC
full spelling ： Pay-per-click
alias ： Cost per click
Pay-per-click is an advertising technique used on websites where an advertiser pays an agreed amount for each click someone makes on a link leading to their web site. The advertiser has typically a small textual ad on a search engine site and pays only if a user clicks on the link in the ad. Many search engines, including Google, Yahoo, AOL and MSN, offer this form of advertising. Ads are served based on keywords or themes.
Google AdWords and Yahoo! Search Marketing, which was formerly Overture, are the largest network operators which using PPC program.