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Packet - This is a small amount of computer data sent over a network. Any time you receive data from the Internet, it comes to your computer in the form of many little packets. Each packet contains the address of its origin and destination, and information that connects it to the related packets being sent.

PHP - PHP is an HTML-embedded Web scripting language. This means PHP code can be inserted into the HTML of a Web page. When a PHP page is accessed, the PHP code is read or "parsed" by the server the page resides on. The output from the PHP functions on the page are typically returned as HTML code, which can be read by the browser. Because the PHP code is transformed into HTML before the page is loaded, users cannot view the PHP code on a page.

Policy - A policy is a set of rules with respect to security, operational management, and communication that is applicable in a specific zone.

POP - See Post Office Protocol

Post Office Protocol - A protocol designed to allow single-user hosts to read mail from a server. There are three versions: POP, POP2, and POP3.