AdMob has announced signing a definitive agreement to be acquired by Google for $750 million. This deal is a major step by the search giant into venturing towards the mobile ad market in its plans to hold equal prominence in both, the mobile advertising space as well as on desktops/laptops.

AdMob is the largest iPhone ad network and has been growing exponentially with the recent acquisition of AdWhirl, a company that’s into serving mobile ads from multiple sources. AdMob’s primary market is the US with India coming in on a distant second and as things stand their network boasts of 15,000 odd mobile websites/applications and has shown a 6.3 times increase in monthly ad requests from 1.6 billion requests in September 2007 to 10.2 billion in September 2009.

This acquisition will take Google from mere Search Ads to Web Display/App Display ads encapsulating each available avenue in the mobile ad market. Omar Hamoui, CEO of AdMob said, “After our deal with Google closes, we will work together to accelerate the pace of innovation in this area. Our product and engineering teams will keep building great products for all of our customers.”