A cookie is a very small text file that is stored on your computer. It is used to remember you and your selections on the website. Cookies are an excellent way for websites to save important information and settings to make things easier for you as a user. For example, when you last visited the site, what you entered in a form so you do not have to repeat the process, selections you made, etcetera. Cookies cannot contain code and so you don't need to worry about advertising, spy ware, viruses or similar. Cookies do not significantly impact on your system. It is only the website that saved the text file that can read it, so nobody else can see what you did here.