In plain English
The percentage of recorded impressions that produced recorded clicks: clicks divided by impressions, multiplied by 100.
Why it matters
This instrument can help answer a focused measurement question when it is connected to a real objective and read alongside relevant context.
Example
A small organisation records this signal for a defined page and period, then compares it with related instruments before deciding whether to investigate a change.
Common misunderstanding
CTR needs context such as query, result type, position and period; it is not a universal quality score.