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what is mean by 'cookies'?
A cookie is a HTTP header that consists of text-only data saved on your computer. This data commonly contains the domain, path, lifetime, and value of a variable that you set. If the lifetime of this variable is longer than the time the user spends at your site, then this string is saved to file for future reference.

Cookies received over the Internet should be considered more useful than dangerous. Without cookies, users could not have customized settings or would have to verify their identity each time they visit a site.


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