Basically Google AdSense is a Google program where pay per clicks are hosted on your website and when someone clicks the ad, you would earn money. Hence it’s a great revenue making opportunity for small, medium websites. Running a website so as to only earn money by Google AdSense is against the policies of Google AdSense, hence one has to include affiliate links or must sell one’s own products too. The money you earn by Google AdSense depends on the traffic towards your website and also how relevant and attractive the advertisements are.