Definitions: D

What is a Database?
A database is a collection of data that is organized so that its contents can be easily accessed, managed, and updated.
What is Decryption?
Decryption is the process of interpreting data which is sent in a hard to read form (encrypted).
What is a Dedicated Server?
A dedicated server is a computer that include a Web server, related software, and connection to the Internet, housed in a Web hosting company's premises, that can be rented exclusively for your own use.
What is Deep Linking?
Deep linking is linking to a page other than the site's home page.
What is Delisting?
Delisting is the removal of pages from a search engine's index.
What are Demographics?
Demographics are the characteristics of a population or audience, such as gender, age group, occupation, income, race, preferences, etc.
What is a Description Tag?
A description tag is a HTML meta tag used to provide a description of a Web page for search engine listings.
What is DHTML?
DHTML (dynamic HTML) is an advanced version of HTML that contains more features, such as animation.
What is a Dial-up Connection?
A dial-up connection is a method of connecting to an Internet service provider using a telephone connection in a system of many lines shared by many users. A dial-up connection can be started manually or automatically by a computer's modem or other device.
What is a Digital Certificate/Signature?
A digital certificate or signature is an electronic 'credit card' that establishes your credentials when doing business or other transactions on the Web.
What is a Discussion Forum?
A discussion forum is a Web site where people meet for open discussion on various topics.
What is Dmoz?
Dmoz (also known as the Open Directory Project) is the largest human-edited Web directory with over 4.7 million web sites, reviewed by a global community of over 89,000 volunteer editors. The Open Directory was founded in the spirit of the Open Source movement, and is the only major directory that is 100% free. There is not, nor will there ever be, a cost to submit a site to the directory, and/or to use the directory's data. The Open Directory data is made available for free to anyone who agrees to comply with its free use license.
What is DNS?
DNS (Domain Name Server) is a machine which translates Internet domain names, such as, to an IP (Internet Protocol) address, such as (a Google IP address).
What is Dogpile?
Dogpile is a metasearch engine that searches four search engines at a time and lists the results from each engine on each page.
What is a Domain?
A domain is the name with which domain name server records are associated that describe subdomains or hosts.
What is a Domain Name?
A domain name is a meaningful and easy-to-remember name for an Internet IP (Internet Protocol) address, such as (a Google IP address).
What is a Doorway Page?
A doorway page (also known as a bridge, entry, gateway, and information page) is an informational page created for the sole purpose of ranking high in search engines for a particular keyword phrase, or specific search engine.
What is Double Opt-in/Optin?
Double opt-in or optin is email that a recipient has previously requested by subscribing at a Web site or via email, and then confirming the request.
What is Download?
Download is copying a file from a remote computer down to your local computer.
What is DSL?
DSL (Digital Subscriber Line) is a technology that transmits high-bandwidth information over ordinary copper telephone lines. Individual connections will typically provide 512 Kbps to 1.544 Mbps downstream and 128 Kbps upstream transfer rates. A DSL line can carry both data and voice signals and the data part of the line is continuously connected.
What is Dynamic Ad Rotation?
Dynamic ad rotation is the delivery of ads on a rotating, random basis so that visitors are exposed to different ads in different pages of a site.
What are Dynamically Generated Pages?
Dynamically generated pages are the database driven Web pages created 'on the fly' (in real-time) depending on the user's interest or request.