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

Unix – Operating system usually written in C and created for multiple use. It contains TCP/IP and is therefore one of the most popular operating systems for Internet servers.

Upload – Transferring files from a PC to a certain remote computer (opposite of download).

URL - (Uniformed Resource Locator) Internet address.

USB - (Universal Serial Bus); a port which serially connects external devices with the computer. It transfers data at great speed (12 Mbit per second), enabling up to 127 devices to be connected in a sequence.