According to Google Analytics, a session is a group of user interactions with your website that take place within a given time frame. A session can be made up of page views, events, form fills, transactions as well as other types of page interactions. The session will start when someone arrives on the site and can end after 3 different instances: 30 minutes of inactivity, at midnight, or when the user enters a different campaign.
Sessions are a metric used to see how long people are spending on a site, what they are doing while on the site, what times of the day or days of the week people are most heavily on the site, and more.
