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What is the difference between sessions and cookies?

Sessions and cookies are indeed different, though they are often used in conjunction or as alternative ways to achieve a purpose, which is for data or authentication to persist over a set period of time, or browser session.

Read more about sessions here:

http://uk3.php.net/manual/en/intro.session.php

Read more about cookies here:

http://uk.php.net/setcookie

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