Unique Visitor
A unique visitor is one distinct person counted once in a period, no matter how many times they visit — as opposed to sessions or pageviews, which count repeat activity. In GA4 the closest equivalent is “Total users” or “Active users.”
Why it matters
Unique visitors tell you reach — how many actual people — while sessions tell you frequency. Confusing the two inflates your sense of audience size: 10,000 sessions might be 3,000 people coming back repeatedly.
A measurement caveat
“Unique” depends on cookies and devices. The same person on a phone and a laptop, or after clearing cookies, often counts as two. Treat it as a close estimate, not an exact headcount.
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