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$_GET: GET request variables, usually in the url (somepage.php?id=1), $_GET['id'] == 1.
$_POST: POST variables, sent through forms with the method="post".
There are several, including $_COOKIE and $_SESSION for cookies and sessions respectively, there is also $_REQUEST and $_SERVER, $_REQUEST will store all GET and POST and COOKIE and SESSION information in one array. $_SERVER contains information about the request and the server itself.
$GLOBALS is the ultimate var.
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