Let me explain. A cookie is a small text file that typically contains two pieces of information: a site name and unique user ID.
This is helpful for making the site more responsive to frequent users by remembering log-in details and such like. It also enables us to track anonymous data, such as how many visitors a website had, what pages were visited and how long was spent on the site.
Cookies have had some bad press in recent years. Some sites and their advertisers have made use of third party cookies that follow users’ activities for advertising and marketing purposes, essentially building up a “user profile” in their database. (Ever visited a website, only to later find adverts for it featured in your Facebook newsfeed? Creepy isn’t it?)