AdSense publishers are bloggers and webmasters who have been approved by the Google AdSense team to participate in the program and earn a cut from the ads placed on their blogs.

In a nutshell this is how the AdSense program works: Advertisers set up accounts in AdWords and Google will attempt to match up the ads and display them on the web pages with relevant content. The hope is that people will see an ad that interests them, and they will click through to the Advertiser's site and eventually invest in their products or services.