Google keyword advertising system
AdWords is a system which display advertisements on Google or other web pages, where Google AdSense is installed. Web pages are selected by similarity with advertisement text or search request. This way advertisements reach clients who are interested in that thing or another.
Auction principle – User who offers the highest price for the service, will have his advertisements displayed more often than others. However he will pay not his offered price, but the second highest User’s. In this way user is protected from non-smart spending. Using the Google word advertisement system advertisement the fee will be received only when someone clicks on the displayed advertisement, also there is a limit on how much can be received during single days.