What Is Semrush?
Semrush is a third-party SEO and digital marketing platform, independent of Google, covering keyword research, rank tracking, competitor analysis and a backlink index, and publishing its own Authority Score for domains.
Why it matters
It is one of the two toolsets whose numbers get quoted in placement listings, and its keyword and traffic estimates are what many buyers use to size an opportunity before spending anything on it.
Example
A buyer checks a candidate site in Semrush, sees the traffic estimate falling for six straight months, and raises it with the seller before ordering.
Common misconception
That Semrush and Ahrefs figures should agree, or that either is what Google sees. Each vendor crawls the web separately and models traffic from its own keyword set, so two tools routinely disagree by wide margins about the same domain.
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