Sessions are properties that enforce state-based communication between two systems. A session is used to store user information temporarily and is also deleted as soon as the user quits the browser or leaves the website.

A session is used for maintaining security activity. A unique identification number, also known as a session ID or session key, is generated by the website and is used to track their users or security-based features independently. In most cases of session availability, it can be traced using cookies too.