Cookies are small data files which are stored on a website visitor’s computer. They are designed to hold a modest amount of data specific to a visitor and the website, and can be accessed either by the web server or the visitor’s computer. This allows the server to deliver a page tailored to a particular visitor, or the page itself can contain some script which is aware of the data in the cookie and so is able to carry information from one visit to the website (or related site) to the next.
There is a lot of concern about privacy and security on the internet. Cookies do not in themselves present a threat to privacy, since they can only be used to store information that the website visitor has volunteered or that the web server already has.
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