Session Class
The session class allows you to maintain a user's state as they browse your website. The session Class stores data inside a cookie, which can optionally be encrypted. You are able to store data inside a database for added security, as this means that the user's cookie must match the database record.
What is stored in a session?
-> the user's unique Session ID
-> The user's IP address
-> The user's User Agent string
-> The "last activity timestamp"
