What are Cookies?
Unfortunately they’re not chocolate chip… It’s a small text file with an anonymous unique identifier sent to a browser and stored on a computer’s hard drive.
The data it contains is from visiting websites, how often they’re visited and the preferences they have about it. This is why you always see ads directly aimed towards you, because they see your cookies and know what you’re interested in. For this reason, some people will “clear their cookies” often.