The session ends when there is no activity for a certain amount of time. By default, this is 30 minutes. You can set a different amount of time using the session timeout option.
For example, the timeout is 30 minutes. A user opens the site and views several pages — the session is registered. Then the user leaves the browser tab open and walks away. Returning 35 minutes later (the timeout period has expired), the user goes to another page on the site. This pageview is considered a new session.
Referrals from advertising systems (such as Yandex.Direct and others) are always considered separate sessions. Even if a user clicked an ad repeatedly (or there were several of them from the same computer) before the session timed out, each of the clicks is a separate session.
When a user exits your site by clicking an external link to any other site.
The process of displaying webpage contents. There are several stages of loading:
Detailed information about page loading is available in the Page load time report.
When the user begins downloading a file from the site.
A numerical value that is based on an attribute of a session or pageview. This amount can be the total or average. For example, pageviews are calculated as the sum of values, while session depth is the average value.
The “non-bounce” internal event is generated in the browser when the set bounce tracking time has passed since the beginning of the session. The registered event time might differ from the actual time due to discrepancies in the time on the server and on the client, or due to latency in sending the event. As a result, a non-bounce session might be registered that is shorter than 15 seconds (or the set duration).
A user who spent a certain amount of time on the site. A user who has a non-duplicated set of characteristics (IP address, browser, OS, cookies, and so on) is considered a unique user. If a user clears cookies, reinstalls the browser, or reinstalls the operating system, this user will be counted as a new user.
Loading one of a site's pages when a user navigates to it. Pageviews also include page refreshes, AJAX site updates, and sending data using the hit method.
A numerical value calculated for the goal specified in the report. This amount can be the total or average. For example, conversions are calculated as the total of all values, and conversion per user is calculated as the average value.
A user action that the site owner is interested in: viewing a specific page, clicking a particular element (such as the “Proceed to Checkout” button), and so on. For more information about types of goals and setting them up, see the section Goals.