What Is The Session In Google Analytics?

Session ..

 

A session is defined as a group of interactions one user takes within a given time frame on your website. Google Analytics defaults that time frame to 30 minutes. Meaning whatever a user does on your website (e.g. browses pages, downloads resources, purchases products) before they leave equals one session
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Google Analytics, a session is a group of hits recorded for a user in a given time period.A hit is a user interaction (pageview,screenview,event,transaction,etc.,) with your website that results in data being sent to the Google Analytics Server.