Updated
A session is a single continuous visit to a website or app. Everything a user does during that time, such as page views, clicks or purchases, is attributed to that session.
How GA4 counts a session
In Google Analytics 4, a session starts with the first page view and ends after 30 minutes of inactivity. Unlike the old Universal Analytics, a new session no longer starts at midnight or when the campaign source changes.
Engaged sessions
GA4 identifies engaged sessions: those lasting longer than ten seconds, with at least two page views or containing a key event. Their share is the engagement rate, and the opposite is the bounce rate.
Sessions vs users
One user can have several sessions, for example on a phone in the morning and on a laptop in the evening. Sessions are useful for comparing channels, while users tell you more about the size of your audience. UTM parameters help attribute sessions to the right source.
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