We all know about ads, which YouTube displays, when we are watching a video. Most often, these ads are irrelevant to the specific video, that we are watching.
For this reason, Google introduce "Google Shopping ads" on YouTube. So, products ads wiil be relevant to each specific video.
According to the official blog of Google Adwords, targeted ads on YouTube will be appeared with an icon "i", in the upper right corner of the video.
By clicking on the "i", related with the video products will be revealed. For example, if you are wathing a video for a photo camera, products ads will appear from related companies that already work with AdWords.
The new ads on YouTube will appear about next month.