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analytics-dictionary / term / tracking & measurement

Session

A session is a group of user interactions on your site or app within a given time frame.

Written by Reflective Data experts · updated Oct 5, 2026

Analytics tools stitch events into sessions so you can talk about visits. In GA4, a session starts with a session_start event and ends after a period of inactivity, 30 minutes by default.

Sessions are a convenience, not a fact of nature. Different tools define them differently, which is one reason numbers rarely match across platforms.

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Bounce rateEngagement rateGoogle Analytics (GA4)Pageview

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