A cookie is a “small piece of data, a small piece of data sent from a website and stored in a user’s web browser” [see wikipedia]. We use cookies in the following actions:
Most of the Browsers can delete cookies and deny cookie-settings for future sessions. Consider that some functions (e.g. fist of all the login-action) do not work without cookies.
Javascript can also be deactivated in the Browser. If your Browser doesn’t support Javascript, be aware that a great amount of functions and tools cannot be used.