Video remarketing is a way to optimize:
- video campaigns
- cost-per-view (CPV) bidding strategies
- bidding strategies
You can show personalized ads to millions of viewers across YouTube and video partner sites, based on their past interactions with your videos or YouTube channel. This is known as “video remarketing.” By reinforcing your message with people who have already seen your videos or channel, you’re more likely to succeed in increasing your return on investment.
So, you’ve uploaded your videos to YouTube, and have been running your TrueView campaign for a while. Video ads provide a range of viewer actions that can be measured and tracked so you can better achieve your advertising goals.
Read more here: https://support.google.com/adwords/answer/3013684