What is Adsense and Its relation with Google?
Google AdSense is a program run by Google that allows publishers in the Google Network of content sites to serve automatic text, image, video, or interactive media advertisements, that are targeted to site content and audience. These advertisements are administered, sorted, and maintained by Google. They can generate revenue on either a per-click or per-impression basis. Googlebeta-tested a cost-per-action service, but discontinued it in October 2008 in favor of a DoubleClick offering (also owned by Google). So the ad network is with the most power-ful industry in the world, Easily we can apply for Adsense.
How does Adsense Work?
How Much Can You Earn With AdSense?
Google Adsense is the best Ad-Network, I'd also suggest this pay-per-click network for your website or blog.