There are two cookies used on this site
The essential one is the session cookie, usually called MoodleSession. This allows this cookie into your browser to provide continuity and maintain your login from page to page. When you log out or close the browser this cookie is destroyed (in your browser and on the server). It is highly recommended you leave this cookie turned on as, without it, it will affect your use of Moodle. The other cookie is purely for convenience, usually called something like MOODLEID. It just remembers your username within the browser. This means when you return to this site the username field on the login page will be already filled out for you. It is safe to refuse this cookie - you will just have to retype your username every time you log in.
Turning cookies on and off in your browser
You have a number of options when it comes to receiving cookies. You can set your browser to reject all cookies, allow only 'trusted' sites to send them, or accept only those cookies from websites you are currently using. We recommend you don't block all cookies as parts of Moodle won't work correctly without them and you may not be able to log in. See the following links for further information on turning cookies on and off in your particular browser: