Google Ad Manager is a product within Google's AdSense network based on a new hosted advertisement management tool.
Google Ad Manager has been seen as a direct threat to OpenX, an on-premise software solution (known previously as OpenAds and phpAdsNew) for managing the advertising campaigns on websites. Both solutions serve and track the performance of ad units sold either directly or introduced by third party networks like Federated Media or Google AdSense. But only Google can â€œuse AdSense to fill unsold inventory or compete on price against other ad networks,â€ optimizing returns for publishers by serving up the most profitable ads from campaigns vying for the same space on a page.
As a hosted solution, Google Ad Manager also has the advantage of an easier setup and administration process since it doesnâ€™t require any server-side installation or code maintenance.