What are cookies?

Cookies are short text files generated by a web server and stored on your computer via browser. When you return to the same site later​, the browser sends the saved ​cookie back and the server gets all the information previously saved ​from you.

Why do we use cookies?

Principle of cookies allows to distinguish individual users and store specific data about them​. E.g. thanks to the cookie, a​ server knows what language settings you have chosen during your last visit or what login name/details it should pre-fill into the ​forms (server remembers​ it from the ​previous visit). Therefore cookies make personification easier.