vCPM, or Viewable Cost Per Mille, is a pricing model that charges advertisers based on the number of times their ad is viewed by users. Unlike traditional CPM (Cost Per Mille) where advertisers pay for ad placements regardless of whether they are seen, vCPM focuses on verified impressions where ads are sufficiently visible to users for a specified duration. This model provides advertisers with greater transparency and control over their ad spend, as they only pay for ads that meet specific visibility criteria. If ads are not properly displayed or fail to meet the visibility standards, advertisers are not charged for those impressions.