Google AdSense : Advertiser's and Publisher's Solution
Google AdSense is the leading solution for both Advertiser's and Publisher's ranging its services from single individual people to big business company's. A small example that the pages that you view generally as for your use or help should consists possessing 80% (My Belief : Reaches 100% in Future) serving with Google AdSense only.
The main reason why major people choose Google AdSense is that their vast Advertiser's in all domain areas. The Pay-Per-Click PPC in Google AdSense is very high when compare to all other AdSense programs.