UDP is a protocol used to transfer data (in the form of ‘datagrams’) across the Internet. Unlike TCP/IP, UDP doesn’t split up messages and re-assemble them at the other end. It is useful for sending small amounts of data, since it saves processing time that would be used to re-assemble packets.

The URL specifies the address of a piece of content on the World Wide Web. The request is made by typing the URL into the web browser, or by clicking on a hyperlink (or link for short): this link may be specified on a web page or in a piece of text in a document, spreadsheet, etc.

The Unix operating system originated at AT&T’s Bell Labs in 1969. Unix is an open source operating system. Since it is not owned by a single vendor, many different Unix versions have been developed since its creation (including Unix-derivative operating systems like Linux). The Open Group holds the ‘Single UNIX Specification’ and the UNIX® trademark and certifies different Unix implementations.

Unicode, used in Microsoft® Windows® NT, Windows 2000 and Windows XP, succeeded ASCII as a means of using binary codes to represent text characters used in the world’s principal languages.