An impression is counted each time an ad is served and appears on a user’s device screen, regardless of whether the user interacts with it. It is one of the most basic and foundational ad delivery metrics used to measure reach and exposure.

Metrics

Ad Fill Rate mobile-advertising-glossary-metrics

The percentage of ad requests that are successfully filled with an ad impression: Fill Rate = (Filled Requests / Total Requests) * 100. Low fill rates may suggest weak demand or misconfiguration.

Metrics

Unique Reach mobile-advertising-glossary-metrics

The number of unique users (or devices/households) exposed to an ad at least once. Useful for understanding total unduplicated audience.

Metrics

Video Duration Metrics mobile-advertising-glossary-metrics

Measures how much of a video ad was watched (e.g., quartile completion, full views, duration rate). Key for video campaign evaluation.

Metrics

Cost Per Action (CPA) mobile-advertising-glossary-metrics

CPA is the amount spent to drive a specific user action (e.g., a subscription, sign-up, or in-app purchase). It’s commonly used in performance-based advertising models.

Metrics

Social Media Metrics mobile-advertising-glossary-metrics

Includes shares, comments, mentions, and sentiment around a campaign. Particularly relevant for cross-channel or influencer campaigns.

Metrics

Win Rate mobile-advertising-glossary-metrics

The percentage of submitted bids that result in an ad impression: Win Rate = (Won Bids / Submitted Bids) * 100. Low win rates might suggest competitive markets or underbidding.

Metrics