Google Adsense

AdSense for content automatically crawls the content of your pages and delivers ads (you can choose both text or image ads) that are relevant to your audience and your site content—ads so well-matched, in fact, that your readers will actually find them useful.

AdSense for search allows website publishers to provide Google web and site search to their visitors, and to earn money by displaying Google ads on the search results pages.

AdSense for mobile content - Have a mobile website? AdSense can help you earn money from your content with a simple, integrated solution.
Get started here.