Cookies are small files containing information such as letters and numbers that are stored on your computer when you visit a web site. Cookies do carry out a number of tasks such as: remembering your preferences, recording what you have put in your shopping basket, or counting the number of people looking at a particular website.
If you wish to opt-out of cookies, you can download Analytics Opt-Out Browser Add-on. Available for all major browsers including IE, Firefox, Chrome, Opera and Safari.
Most web browsers have cookie/privacy options, you can delete or allow all cookies and even block third-party cookies. On some browsers, like Mozilla Firefox for instance, you can choose tracking in 'security options' to tell websites not to track you. The latest browser with new technologies that allows you to block lists of websites you want and also block the third-party cookies, analytics and ads.