A cookie is a small text file that a website saves on your computer or mobile device when you visit a site. It enables the website to remember your device, your actions, and your preferences (such as language, font size, and other display preferences) over a period of time.
Cookies can be useful, as in the case of your preferences, so you don't have to keep re-entering them whenever you come back to the site or browse from one page to another.
Note: Cookies are not the only way to recognize or track visitors to a website. We may use other, similar technologies from time to time, like web beacons (sometimes called "tracking pixels" or "clear gifs").