<p>Viewability is a measurement used by advertisers to determine how well their ads are being seen by readers. Advertisers can define viewability in different ways, but <strong>an ad is typically considered “viewable” when at least half the ad is seen on the screen by an actual human (not a bot) for at least one second (for display ads) or two seconds (for video ads).</strong></p> <p>Why is viewability important? Knowing the viewability of different ad types and ad placements is ess