Definitions for "Click fraud"
Clicking on an ad repeatedly in order to charge the advertiser more or make money because the ad is displayed on a web page where the person doing the clicking makes money for every click. See this article for more information on click fraud with Google's Adwords.
Cheating the advertisers by clicking on pay per click links or banners with no intention of converting but rather to generate revenue for the web sites serving the ads.
The practice of clicking on a website's pay-per-click ad campaign for reasons other than legitimate business interest.