Sixth class (14/11/2007)

A small data file created by a Web server that is stored on your computer either temporarily for that session only or permanently on the hard disk (persistent cookie). Cookies provide a way for the Web site to recognize you and keep track of your preferences
Cookies Are Beneficial
Cookies are commonly used to "maintain the state" of the session as a user browses around the site. The shopping cart is an example. You can place an item in the cart, switch to another page or even another site, and when you come back, the site knows who you are, and you can continue with the order. Without cookies, the site would not be able to identify you automatically because the Internet is "stateless.
Cookies contain a range of URLs (addresses) for which they are valid. When the Web browser or other HTTP application sends a request to a Web server with those URLs again, it also sends along the related cookies. For example, if your user ID and password are stored in a cookie, it saves you from typing in the same information all over again when accessing that service the next time. By retaining user history, cookies allow the Web site to tailor the pages and create a custom experience for that individual.
Your Cookies Know You
Quite a bit of personal data may reside in the cookie files in your computer. As a result, this storehouse of private information is sometimes the object of attack