UDP

User Datagram Protocol. UDP is a stateless protocol in that UDP makes no provision for acknowledgement of packets received.

UNIX

UNIX is a multi-user operating system that are commonly used for servers and back-end tasks. It was first developed at Bell Labs but later universities began using it to create a academic network(s) to share information. UNIX can come in serveral flavours

UNIX Shell

A powerful command line based environment that is used to execute commands in UNIX operating systems. It is similar to dos but has a lot more capabilties.

URL

Universal Resource Locator. It is an address used to locate files on a network, including the Internet.