Sessions work by creating a unique id (UID) for each visitor and store variables based on this UID. The UID is either stored in a cookie or is propagated in the URL.
The most significant differences between the two are that cookies are stored on the client, while the session data is stored on the server. As a result, sessions are more secure than cookies (no information is being sent back and forth between the client and the server) and sessions work even when the user has disabled cookies in their browser. Cookies, on the other hand, can be used to track information even from one session to another by setting it's time( ) parameter
The session.save_path setting specifies the directory name for session data.
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