Simply put, a session is a series of user interactions on your site, beginning with the first page they visit and ending with a period of inactivity lasting longer than 30 minutes.
For example, a user finds your site in a list of Google search results and clicks through to your landing page. In your FullStory dashboard, their session will begin with the landing page, and last until they have not performed any activity on your site for 30 minutes or longer. If they revisit your site after 30 minutes, their activity will be recorded as a new, separate session.
After reading our simple answer, if you're still wondering why you sometimes see longer inactive periods in a session you might want to read our more technical answer:
In short, sessions organize continuous user activity over a given period of time. For a new page to be included in an existing session, the following must be true:
- The value in the fs_uid cookie must be the same as in an existing page.
- The new page's load time is within 30 minutes of the load time of the existing page.
If these two things hold true, then the new page will be attached to an existing session. Note that the fs_uid value used for this computation is not the same as the identifier passed to FS.identify() -- rather, it is an internal identifier used to tie pages together on a single device. Each device has its own set of cookies, and the identifier passed to FS.identify() is used to tie the sessions recorded on different devices into a single "user" that you see in the FullStory UI. So if a single person is using your app on a desktop and phone simultaneously, they'll end up with two sessions, one for each device, but both associated with the same user in the UI.
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