AdSense is the contextual advertising network run by the web giant Google.It provides contextual CPC and CPM advertising.The ads presented in AdSense are of real high quality and has very high CPC and CPM costs.Google started adsense in 2003 which has grown a lot in recent years.But Google poses some real harsh policies which even result in the ban on the publisher like you cannot place ads of any other network etc etc.They are very strict on click fraud too.Knowingly or unknowingly doing that result in ban for lifetime.

If You are a publisher or even a blogger with some real good content on your website the AdSense will let you in and let you earn real good buck.But it is not easy to get in there.As they manually approve or reject applications.Their main purpose is to get quality publishers.

For Advertisers they provide services like Google AdWords which is best in online advertising it proves cost effective to advertise on Google.They have a very Innovative and sound technology which provides good reporting and conversion rates as compared to other ad networks.