Small piece of information that a Web server sends to your computer hard disk via your browser. Cookies contain information such as login or registration information, online shopping cart information, user preferences, etc. This information can be retrieved by other web pages on the site , so that this site can be customized. For example, when you're shopping online, the cookie contains a list of all the items you have in your shopping cart. When it's time to pay, the server takes the cookie from your browser to see what you have bought and you'll get a nice bill...