Obviously anyone selling ads on their websites would absolutely want to make as much as possible from every ad posted on the site. PubMatic.com's purpose is to help websites accomplish that. It helps to increase revenue per ad, maximize click throughs and get consolidated reports instantly. PubMatic is an account that can be set up in just a few minutes, like Google AdSense for instance. PubMatic.com is free for its Alpha users, and the wording that they use seems as if they are impying that when they do launch the beta version of their site it will no longer be free, so if you are interested in possibly using the service, hop on it while you can still give it a test spin for free.