What is Session ID?
A unique timestamp parameter generated when a user starts a visit. It groups all the events that occur during that specific visit together.
In GA4, a session is not a discrete structural element like it was in Universal Analytics. Instead, absolutely everything in GA4 is an event. To figure out which events belonged to the same visit, GA4 attaches a ga_session_id parameter to every single event.
How it works
The Session ID is simply the UNIX timestamp of when the session began. As long as the user continues to trigger events (pageviews, clicks) without a 30-minute period of inactivity, the Session ID remains the same. If 30 minutes pass, the next event will generate a completely new Session ID, starting a new session.
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