Database-driven

database-driven web site means that the particular website is connected to a database and the content of that web page is based in part on information extracted from those databases.

Database-generated

When a web page is created dynamically from a database, it is called as database-generated web page. It will be in contrast with an HTML page which is static.

Dayparting

Turning ad campaigns on or off, changing ad bid price, or budget constraints based on bidding more when your target audience is available and less when they are less likely to be available.

Dead Link

A link which is no longer functional.

Most large high quality websites have at least a few dead links in them, but the ratio of good links to dead links can be seen as a sign of information quality.

Dedicated Server

Server which is limited to serving one website or a small collection of websites owned by a single person.

Deep submitting

Deep submitting is the process of submitting URLs of pages deep in a site to the search engines. Some search engine do not encourage deep because it unnecessarily clogs up their submission database.

Deep Linking

Deep linking makes the spiders find the pages quciker. It makes the job of search engines lesser, as deep linking happens to the content from the home page and it makes sure the spiders find the pages easier and fast.

Deep Link Ratio

The ratio of links pointing to internal pages to overall links pointing at a website. A high deep link ratio is typically a sign of a legitimate natural link profile.

Demographics

Statistical data or characteristics which define segments of a population.

Del.icio.us

Popular social bookmarking website.

De-Listing

Temporarily or permanently becoming de-indexed from a directory or search engine.

Digg

Social news site where users vote on which stories get the most exposure and become the most popular.

Directory

A directory enables choosing the right category and composing key pharses rich description and ensure maximum visibility. They are grouped list of sites organized by topic.

Description

Directories and search engines provide a short description near each listing which aims to add context to the title.

DMOZ

The Open Directory Project is the largest human edited directory of websites. DMOZ is owned by AOL, and is primarily ran by volunteer editors.

DNS

Domain Name Server or Domain Name System. A naming scheme mechanism used to help resolve a domain name / host name to a specific TCP/IP Address.

Doorway page

Doorway is also known as a bridge page. It is always not an important part of the website, but for the purpose of driving traffic.

Dreamweaver

Popular web development and editing software offering a what you see is what you get interface.

Dynamic Content

Content which changes over time or uses a dynamic language such as PHP to help render the page.

Dynamic Languages

Content which changes over time or uses a dynamic language such as PHP to help render the page.

Dynamic Page

Programming languages such as PHP or ASP which build web pages on the fly upon request.

Dynamic IP Address

A dynamic IP Address is also flexible in nature. It is a temporary IP Address. It is an identification assigned to a node in an IP network.

Domain

Domain is the URL of a website. When a user types a URL into a web browser, the Domain Name Server translates the URL into an IP address which is then used to find the actual website requested by the user.

Duplicate Content

A content copied form other web pages to increase ranking with the help of more kewords is called as duplicate content. Some search engine like Google have a filter that looks for duplicate text and thereby pushing the duplicated content deep inside the results.

DHTML

Stands for dynamic HTML.

Description Tag

Refers to the information contained in the description META tag. This tag is meant to hold the brief description of the web page it is included on. The information contained in this tag is generally the description displayed immediately after the main link on many search engine result pages.

Directory Search

Also known as a search directory. Refers to a directory of web sites contained in an engine that are categorized into topics. The main difference between a search directory and a search engine is in how the listings are obtained. A search directory relies on user input in order to categorize and include a web site. Additionally, a directory usually only includes higher-level pages of a domain.

Display URL

The web page URL that one actually sees in a PPC text ad Display URL usually appears as the last line in the ad; it may be a simplified path for the longer actual URL, which is not visible.

Dynamic Text (Insertion)

This is text, a keyword or ad copy that customizes search ads returned to a searcher by using parameters to insert the desired text somewhere in the title or ad When the search query (for example, "hybrid cars") matches the defined parameter (for example, all brands of electric/gasoline passenger cars AND SUVs), then the associated term (hybrid) is plugged into the ad Dynamic insertion makes the ad mirror exact terms used in the search query, creating very relevant ads. See also DKI (Dynamic Keyword Insertion).