A session is a group of user interactions with your website or app that take place within a given time frame. Learn more about sessions
In Analytics, a session initiates when a user either opens your app in the foreground or views a page or screen and no session is currently active (e.g. their previous session has timed out).
By default, a session ends (times out) after 30 minutes of user inactivity. However, you can adjust the session timeout period. There is no limit to how long a session can last.
An engaged session is a session that lasts longer than 10 seconds, has a conversion event, or has at least 2 pageviews or screenviews.