Which bidding type is only available for ads on the Display Network?
- Viewable cost-per-thousand impressions (vCPM)
- Target cost-per-acquisition (CPA)
- Cost-per-view (CPV)
- Maximize clicks
With vCPM bidding, you bid for your ad based on how often it appears in a viewable position on the Google Display Network. You set the max amount you want to pay for viewable ads, whether they’re clicked or not.
Read more here: https://support.google.com/adwords/answer/2630842?hl=en