If you are generating revenue off your website or blog, chances are you serve banner ads and they are either updated manually by adding the images and URLs into the source codes or with the help of external ad-serving scripts like OpenX or OIO Publishers.
Google has a similar web service, call the Google Ad Manager. In a nutshell, it is a simple (and free) web service that helps you manage banner ads. It also comes with a pretty complete inventory report module. Ad Manager integrates with AdSense, therefore webmasters have the ability to serve AdSense ads if there’s no banner for any particular slot. Here’s a quick look into advantages of Google Ad Manager:
