What is a cookie?
A cookie is a file that is downloaded to your computer when you access certain websites, for example, this one. Cookies allow said websites, among other things, to store and recover information about a user’s browsing activity and operating system. Depending on the information that they contain and the operating system, they can be used to recognize the user.
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 cookies settings by clicking “Tools”, “Options” and “Privacy”.
Blocking cookies will have a negative impact upon the usability of some websites.