Adsense is an advertising program that let web masters use to generate income from their websites. But your website must fulfill all expectations of this program. Before showing ads on your website, Google must approve your website. If you want your website to be approved by Google, you must keep all terms and conditions of this program on your mind at the time of designing and developing your website.In fact, adsense is an ad-placement program that make use of Google’s proprietary search capabilities to decided the best placement for ads that are purchased through Google AdWords program.
Adsense ads are also called contextual advertising. It means adsense ads appear in the context of surrounding content. In other words, adsense ads are related to the content of pages on which those ads appear.
How does Adsense work?
Adsense ads are also called contextual advertising. It means adsense ads appear in the context of surrounding content. In other words, adsense ads are related to the content of pages on which those ads appear.

Understanding Google Adsense