Session and Cookies

[eluser]WanWizard[/eluser]
CI uses a database table for session storage. The session cookie (you always need something to link the user to his/her session) only contains some key values to be able to retrieve the correct session record. It is not used to store any session data.

You can, as a fallback for environments without a database, use cookies for simple session storage. Which you should avoid if possible.

This is all explained in the manual.