---
title: "What is Ad Viewability?"
url: https://fibr.ai/glossary/ad-viewability
description: "Ad viewability measures if an ad was actually seen by users, serving as a key metric for evaluating ad performance and effectiveness."
last_updated: 2026-05-05T11:55:50.616975+00:00
---
Ad viewability answers a simple but crucial question: did the ad actually appear on screen long enough for someone to notice it? A display banner buried at the bottom of a page may count as “served” but won’t register as “viewed” if no one scrolls down.

Industry standards, like the Media Rating Council’s rule that 50% of pixels must be visible for at least one second, help advertisers separate valuable placements from wasted ones.

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