Inside AdWords: Use keywords and placements together on the content network
The Google AdWords Blog announced that AdWords advertisers can now combine keyword-targeted and placement-targeted campaigns in the same ad group. This allows for the targeting of keywords on contextually relevant pages and at the same time the ability to use placements to set specific bids or restrict your targeting to specific sites. In the past, you were not able to manage your campaign this way.
This is a feature available within the content network and is optional. For more information, check out the Google help document.