← Glossary
Viewability
Whether an ad was actually rendered on screen and eligible to be seen, distinct from completion.
Viewability measures whether a served ad was actually rendered in a viewable state — not whether it was watched to completion (that's VCR), and not the same standard as web display viewability, which relies on pixel-in-viewport measurement that doesn't apply to a full-screen TV app. CTV viewability instead confirms foreground app state, active playback, and audio-not-muted signals via VAST 4.x verification nodes and MRC-aligned standards.