A cookie is a file containing an identifier (string of letters and numbers) sent by web servers to web browsers and stored by the web browsers. The identifier is then sent back to the server each time the browser requests a page from the server. This enables a web server to identify and track web browsers.
Cookies do lots of different jobs, like helping us understand how the website is being used, letting you navigate between pages efficiently, remembering your preferences, and generally improving your browsing experience. Cookies can also help ensure marketing you see online is more relevant to you and your interests.
There are two main kinds of cookies: persistent cookies and session cookies. A persistent cookie will be stored by the web browser and will remain valid until its expiry date, unless deleted by the user before the expiry date; a session cookie, on the other hand, will expire at the end of the user session, when the web browser is closed.
You can also delete cookies already stored on your computer by following the instructions provided by your particular browser.