Glossary - U
UDP -- (User Datagram Protocol)
One of the protocols for data transfer that is part of the TCP/IP suite of protocols. UDP is a "stateless" protocol in that UDP makes no provision for acknowledgement of packets received.
Unix
A computer operating system (the basic software running on a computer, underneath things like word processors and spreadsheets). Unix is designed to be used by many people at the same time (it is multi-user) and has TCP/IP built-in. It is the most common operating system for servers on the Internet.
Apple computers' Macintosh operating system, as of version 10 ("Mac OS X"), is based on Unix.
Upload
Transferring data (usually a file) from a the computer you are using to another computer. The opposite of download.
URI -- (Uniform Resource Identifier)
An address for s resource available on the Internet.
The first part of a URI is called the "scheme". the most well known scheme is http, but there are many others. Each URI scheme has its own format for how a URI should appear.
Here are examples of URIs using the http, telnet, and news schemes:
www.matisse.net/files/glossary.html
telnet://well.sf.ca.us
news:new.newusers.questions
URL -- (Uniform Resource Locator)
The term URL is basically synonymous with URI. URI has replaced URL in technical specifications.
URN -- (Uniform Resource Name)
A URI that is supposed to be available for along time. For an address to be a URN some institution is supposed to make a commitment to keep the resource available at that address.
See also:
USENET
A world-wide system of discussion groups, with comments passed among hundreds of thousands of machines. Not all USENET machines are on the Internet. USENET is completely decentralized, with over 10,000 discussion areas, called newsgroups.
UUENCODE -- (Unix to Unix Encoding)
A method for converting files from Binaryto ASCII (text) so that they can be sent across the Internet via email.
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License
This Glossary of Internet Terms is licensed under the Creative Commons "Attribution-ShareAlike" license.
The original author and copyright holder is Matisse Enzer, and the current version of the Glossary is available at
