Cookies facilitate certain features that can make the surfing experience more convenient and valuable for Web users.
A "cookie" is a small piece of information which a web server can store on your web browser. This is useful for having your browser remember some specific information which the web server can later retrieve. As you browse the web, some cookies are "set" on your Web browser. When you quit your browser, some cookies are stored in your computer's memory in a cookie file, while some expire, or disappear. All cookies have expiration dates. The cookie is set on a particular browser on a particular computer, so when you use a different computer, the cookie will not exist.
Cookies are used, for example, when a browser stores your password to a particular site so that you do not have to input it every time you visit. Cookies are also used to store preferences you express for information that is then aggregated and presented to you. Instances where cookies are most commonly used include:
If you decide to register for an informational site, such as a newspaper, periodical or an interest group site, or even a chat group or on-line community, so that you can use it on a regular basis, you will likely be asked to supply some information about yourself. Often cookies are used so that you do not have to identify yourself every time you re-enter the site.
Cookies allow users to indicate what types of information they are interested in receiving when they visit a particular site. Users can then view only what they are interested in and not waste time with news or information of no interest to them.
Web Site Tracking
Tracking allows site owners to find out what pages visitors link to, and interpret or infer what is interesting to them. This helps the owners of sites to keep their content fresh and relevant.
Cookies cannot be used to obtain data from your hard drive, get your e-mail address or steal sensitive or personal information about you. The only way that any private information could be part of your cookie file would be if you personally gave that information to a Web server. Also, each cookie can only be read by the server that set it, so strange servers cannot view or steal the information in a cookie that you have previously accepted.
If you, as a visitor, want to disallow cookies you can do so on your Web browser.