What Are Cookies?
Cookies are small text files that are placed on your computer or mobile device when you visit a website. They are widely used by website owners to make their websites work, or to work more efficiently, as well as to provide reporting information. Cookies help the website remember your actions and preferences over a period of time, so you don't have to keep re-entering them whenever you come back to the site or browse from one page to another.
These files are standard across the modern web. A cookie itself does not contain executable code, and it cannot access other files on your device. It stores a small amount of text — typically a unique identifier and a few preference values — that your browser sends back to the originating server with each subsequent request.