DHTML -- (Dynamic Hypertext Markup Language)
DHTML refers to web pages that use a combination of HTML, JavaScript, and CSS to create features such as letting the user drag items around on the web page, some simple kinds of animation, and many more.

DNS -- (Domain Name System)
The Domain Name System is the system that translates Internet domain names into IP numbers. A "DNS Server" is a server that performs IP translation.

Domain Name
The unique name that identifies an Internet site. Domain Names always have 2 or more parts, separated by dots. The part on the left is the most specific, and the part on the right is the most general. A given machine may have more than one Domain Name but a given Domain Name points to only one machine. For example, the domain names:

thundercloud.net
chipper.thundercloud.net
store.thundercloud.net

All point to the same machine (server).

Download
Transferring data (usually a file) from one computer to another.

DSL -- (Digital Subscriber Line)
A method for moving data over regular phone lines. A DSL circuit is much faster than a regular phone connection, and the wires coming into the subscriber's premises are the same (copper) wires used for regular phone service. A common configuration of DSL allows downloads at speeds of up to 1.544 megabits per second, and uploads at speeds of 128 kilobits per second. This arrangement is called ADSL: Asymmetric Digital Subscriber Line. ADSL is the most common form of DSL.

Email -- (Electronic Mail)
Messages containing text and sometimes graphics and attachments,  sent from one person to another via computer. E-mail can also be sent automatically to a large number of addresses (mass mailings, announcements, spam).

Ethernet
A very common method of networking computers in a LAN (Local Area Connection). There is more than one type of Ethernet. The standard type is"100-BaseT" which can handle up to about 100,000,000 bits-per-second and can be used with almost any kind of computer.

Extranet
An intranet (closed network) that is accessible to computers that are not physically part of a company's' own private network, but that is not accessible to the general public, for example to allow vendors and business partners to access a company web site. Often an intranet will make use of a Virtual Private Network. (VPN.)

FAQ -- (Frequently Asked Questions)
FAQ are documents that list and answer the most frequently asked questions on a particular subject.  FAQ are usually written by people who have grown tired of answering the same questions over and over :-)

Firewall
Software, hardware or a combination of hardware and software that separates a Network into two or more parts and isolates a machine or machines from the WAN (Wide Area Network) for security purposes.

Flame
Flame has refers to any kind of derogatory comment no matter how witless or crude. Used a a verb - To "Flame" someone or a group of people, means to sent or post denigrating comments. A "Flame War" is usually a war of nasty comments sent back and forth between two (or more) people. Normally, a waste of time and not useful.

FTP -- (File Transfer Protocol)
A very common method of moving files between two Internet sites. FTP is a way to login to another Internet site for the purposes of retrieving and/or sending files. There are many Internet sites that have established repositories of material that can be obtained using FTP, by logging in using the account name "anonymous", thus these sites are called "anonymous ftp servers". FTP was invented and in general use long before the advent of the World Wide Web and originally was always used from a text-only interface.