A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

P
Packet Switching
Packet switching is the method used to send data around the Internet. It works by breaking data into chunks, each chunk has an address of where it came from and where it's going. These chunks are then sent by various routes across the Internet to the destination machine, which re-assembles them in order.

Password See login

Plug-in
A piece of software that adds extra functionality to a larger application programme. The Flash player, Quicktime player and Real player are all plug-ins for Internet browsers.

Pop-up
A small window that "pops up" on your screen. Pop-ups on the Internet are usually programmed in javascript and are often created to be smaller than the normal browser window.