GNU - Standing for GNU's not UNIX,
this is a UNIX-compatible software system developed by the Free Software
Foundation (FSF). Anyone can download, modify and redistribute GNU software.
Linux systems rely heavily on GNU software and in the past, GNU systems
used the Linux kernel. This close connection has led some people to mistakenly
equate GNU with Linux. They are actually quite separate. In fact, the
FSF is developing a new kernel called HURD to replace the Linux kernel
in GNU systems.
HTML - Short for HyperText Markup Language, the authoring language used
to create documents on the World Wide Web.
HTML is similar to SGML, although it
is not a strict subset. HTML defines the structure and layout of a Web
document by using a variety of tags and attributes.
LAN - A computer network that spans a relatively small area. Most LANs
are confined to a single building or group of buildings. However, one
LAN can be connected to other LANs over any distance via telephone lines
and radio waves. A system of LANs connected in this way is called a wide-area
Linux - a computer operating system and its kernel. It is one of the
most prominent examples of free software and of open-source development:
unlike proprietary operating systems such as Windows, all of its underlying
source code is available to the public for anyone to freely use, modify,
improve, and redistribute.
In the narrowest sense, the term Linux refers to the Linux kernel, but
it is commonly used to describe entire Unix-like operating systems (also
known as GNU/Linux) that are based on the Linux kernel combined with libraries
and tools from the GNU Project and other sources. Most broadly, a Linux
distribution bundles large quantities of application software with the
core system, and provides more user-friendly installation and upgrades.
Desktop environments such as GNOME and KDE are sometimes generically associated
with Linux and are often referred to as such, but this is incorrect: a
number of other operating systems, including FreeBSD use them.