Sessions vs. Users vs. Active Users
GA4's "Users" metric counts active users, which is usually a smaller, stricter number than older reports showed.
What it means
A session is one visit; a user is a person, who might have several sessions. GA4's default "Users" metric specifically means active users — people who had an engaged session or triggered specific events — which is a narrower definition than the total-users count Universal Analytics used to show.
Why it matters
If you're comparing GA4 user counts to old Universal Analytics reports, GA4 will often show fewer users for the same traffic, and that's not a tracking problem — it's a different, stricter definition of who counts. Not knowing this is a common reason business owners think their traffic has quietly declined when it hasn't.
ask datanephew
Why does GA4 show fewer users than my old reports did?
Ask datanephew to explain the users number alongside your sessions and engaged sessions — the shift usually comes from GA4's stricter "active users" definition, not from an actual drop in traffic.
How many people actually visited my site last month, not just sessions?
Ask datanephew for active users over that period — it's the closest GA4 equivalent to "how many different people came by."