What is Google AdSense and how to use it

Google AdSense is a platform that allows webmasters to display ads on their sites. Google provides the ads and pays the master when a visitor clicks on an ad on their site.
Google AdSense is an advertising network, which means that it offers advertisers the opportunity to show ads on other sites in its network. When someone visits one of these partner sites and clicks on one of these ads, the ad user pays Google for this click. Google then gives a portion of that money to the buyer who placed the ad.