What is a cookie?
Cookies are text files containing small amounts of information, which your computer or mobile device downloads when you visit a website. When you return to these websites - or visit other websites that use the same cookies - they recognise these cookies and therefore your browsing device.
Cookies help websites to do lots of different jobs, like letting you navigate between pages efficiently, remembering your preferences and generally improving your browsing experience. They can also help to ensure that adverts you see online are more relevant to you and your interests.