A view is typically counted when a viewer watches an ad for a certain amount of time, typically a few seconds. The exact time required to count as a view can vary by platform and advertiser
Video Completion Rate. VCR is a metric that measures the percentage of video ad views that the viewer completes. It is calculated by dividing the number of completed views by the number of video starts
View-Through-Rate. VTR is a metric that measures the percentage of impressions that result in view of a video ad. It is calculated by dividing the number of views by the number of impressions
Cost per completed view. CPCV is a metric that measures the cost of each completed view of a video ad. It is calculated by dividing the total cost of the campaign by the number of completed views