>AdWords was primarily built by purchasing the biggest competitor, DoubleClick. Your timeline is not right. Google was created in 1998. DoubleClick was acqui

>AdWords was primarily built by purchasing the biggest competitor, DoubleClick. Your timeline is not right. Google was created in 1998. DoubleClick was acquired by Google +9 years later in 2008. AdWords was a homegrown Google project starting around 2000. AdWords was an internally built auction-based system selling keywords using some ideas from Goto/Overture. In contrast, Doubleclick was an ad-exchange-network marketplace for publishers and advertisers. This was a different market from AdWords that Google wanted to expand into. Today, yes, both products are more integrated with each other.