What are cookies and why do you use them?

A cookie is a piece of data stored on a user's computer hard drive, containing information about that user. A cookie can only be accessed across the Internet by the website that placed it there. Cookies are used by the website to add functionality and security. You may choose to reject a cookie that this website attempts to place on your computer; however, you may then be limited in your use of some areas of the website. The use of cookies in this way is widespread and commonly accepted by the Internet community.