An HTTP cookie (also called web cookie, Internet cookie, browser cookie, or simply cookie) is a small piece of data sent from a website and stored on the user’s computer by the user’s web browser while the user is browsing. Cookies were designed to be a reliable mechanism for websites to remember stateful information (such as items added to the shopping cart in an online store) or to record the user’s browsing activity (including clicking particular buttons, logging in, or recording which pages were visited in the past). They can also be used to remember arbitrary pieces of information that the user previously entered into form fields such as names, addresses, passwords, and credit card numbers.
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 Safari, click Safari in the top left corner of your computer and then click “Preferences”, “Privacy”, and then “Always Block”.
In Google Chrome, click the three dots in the top right corner, click “Advanced”, under “Privacy and secruity” click “Content settings”, “Cookies”, and then from there you can turn the cookies off or on.
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.