WHAT IS A COOKIE?
A cookie is a piece of data that is stored by a website within an internet browser or the hard drive of your computer if you agree. Cookies contain information that is transferred to your computer's hard drive. This data is then sent back to the same website by the browser. Cookies act as a reliable device for websites to remember things that an internet browser has done in the past – this includes clicking particular buttons, log in details, or having read pages on that site previously.
Typically, a cookie contains information such as the domain from which the cookie has come from, a value which is usually a random unique number as an identifier and the lifetime (expiry) of the cookie.