In more detail
"Organic" distinguishes earned search visibility from paid. Google is explicit that the two are separate: advertising with Google "won't have any effect on your site's presence in our search results" and Google "never accepts money to include or rank sites" in organic results (source).
Organic traffic is measured in two places, and the numbers rarely match:
- Google Search Console counts clicks from Google's results to your site, including from AI features. It doesn't include other search engines.
- Analytics tools such as Google Analytics 4 count sessions that arrive from any search engine. They may miss visits where people decline cookies or block tracking, and some visits are misattributed.
Traffic changes for many reasons besides SEO work: seasonality, news events, competitors, core updates, changes to the results page layout and tracking problems. Comparing the same period year on year helps separate seasonal patterns from real trends.
Traffic on its own isn't a business result. A page attracting thousands of visitors who never enquire is worth less than one bringing a few dozen buyers.
Why it matters when hiring an agency
Organic traffic is a useful leading indicator, but it shouldn't be the main measure of success. Ask agencies to report organic traffic alongside organic conversions and, where possible, revenue.
Be wary of traffic guarantees and of reports that celebrate traffic growth from irrelevant content. To see what extra organic traffic could be worth to you, try our SEO ROI Calculator, which turns visits into leads, customers and revenue using your own numbers.