Netiquette
The etiquette on the Internet.

Netizen
Derived from the term citizen, referring to a citizen of the Internet, or someone who uses networked resources. The term connotes civic responsibility and participation.

Netscape
A WWW Browser and the name of a company. The Netscape (tm) browser was originally based on the Mosaic program developed at the National Centre for Supercomputing Applications (NCSA).
See also: Mosaic

Network
Any time you connect 2 or more computers together so that they can share resources, you have a computer network. Connect 2 or more networks together and you have an internet.

Newsgroup
The name for discussion groups on USENET.
See also: USENET

NIC -- (Network Information Centre)
Generally, any office that handles information for a network. The most famous of these on the Internet was the InterNIC, which was where most new domain names were registered until that process was decentralized to a number of private companies. Also means "Network Interface card," which is the card in a computer that you plug a network cable into.
See also: Domain Name, Network

NNTP -- (Network News Transport Protocol)
The protocol used by client and server software to carry USENET postings back and forth over a TCP/IP network. If you are using any of the more common software such as Netscape, Nuntius, Internet Explorer, etc. to participate in newsgroups, then you are benefiting from an NNTP connection.
See also: Client, Server, TCP/IP

Node
Any single computer connected to a network.