What is a cookie?
A cookie is a small text file that may be placed on your device when you visit a website so that the site can remember who you are.
A cookie will typically contain the name of the domain from which the cookie has come, the "lifetime" of the cookie, and a value, usually a randomly generated unique number.
The only personal information a cookie can contain is the information that you supply yourself. A cookie cannot read data from your device or read any other cookie files created by other websites.
The cookies that are issued merely contain a unique number and therefore contain no personal data.
You can find more information on cookies, their use and your rights here.