What you mean is what are cookies on a computer
(what are cookies on the computer
The cookies have got many names, you know? 1. HTTP cookie, 2. web cookie, 3. Internet cookie (I like it!
), 4. browser cookie (probably it's the best one) and 5. simply 'cookie'.
What are they? Well, they are small pieces of data sent from website/websites and stored on the users' computers by the users' web browsers (while the users are browsing). Simple, isn't it.