What is YouTube promoted videos?

Back in 2006, Google for $ 1.65 billion to buy YouTube.com and then tried to make it turn a profit. They are trying to achieve this goal, video YouTube promoted videos is one of show sponsors on the right side. Paid video working as Google's ads in the same way. Advertisers choose their goals which terms and their video only show their only costs were actually the basis of their number of videos when you search for those keywords. Google AdSense + YouTube promoted video =?