Cookies are files sent by web servers to web browsers, and stored by the web browsers.
The information is then sent back to the server each time the browser requests a page from the server. This enables a web server to identify and track web browsers.
There are two main kinds of cookies: session cookies and persistent cookies. Session cookies are deleted from your computer when you close your browser, whereas persistent cookies remain stored on your computer until deleted, or until they reach their expiry date. This website only uses temporary session cookies.
Most browsers allow you to refuse to accept cookies.
In Internet Explorer, you can refuse all cookies by clicking "Tools", "Internet Options", "Privacy", and selecting "Block all cookies" using the sliding selector.
In Firefox, you can adjust your cookie settings by clicking "Tools", "Options" and "Privacy".
In Safari, you can adjust your cookie settings by clicking "Safari", "Preferences", then go to the "Privacy" tab.
In Chrome, you can adjust your cookie settings by clicking the menu button on the browser toolbar, select "Settings", "Show advanced settings", then in the "Privacy" section, click the "Content settings" button and navigate to the "Cookies" section.
Blocking cookies will have a negative impact upon the usability of some websites.