Cookies are information stored by a server on a visitor's computer during their first visit to the site and used on subsequent visits to the site.
This may be information obtained without asking (e.g., viewing habits), or information provided by the user (name, preferences).
The server records this information in a text file and stores this file on the visitor's hard drive.
What do your cookies say about you? Search your computer for the cookie files – You might be surprised.