Cookies are small text files that are stored on your computer or mobile device by websites you visit. The tasks of cookies are different. Cookies Help the website to remember your settings, e.g. Language, font size, user name, and other settings so you don't have to reconfigure them when you visit again.
Some cookies are necessary for the operation of the site, some are designed to improve user experience, and some are also used to monitor visits to the website, which helps its manager to continuously improve the website and the user's experience with it.