A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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 link - Link to a page from one website that is located deep in the site from a different website.
De-Listing - Temporarily or permanently becoming de-indexed from a directory or search engine.
Directory - Organization of websites based on themes. The Open Directory (ODP) and the Yahoo Directory are the two largest directories on the Internet.
Direct Hit - A system that counts clicks by the user on various serps.
Doorway pages - Web pages created specifically for search engine rankings and not for the benefit of visitors.
DMOZ - The Open Directory Project is the largest human edited directory of websites. DMOZ is owned by AOL, and is primarily run 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.
Duplicate Content - Content which is duplicate or near duplicate in nature.Search engines do not want to index multiple versions of similar content.
Dynamic content - Content which changes over time or uses a dynamic language such as PHP to help render the page.
Dynamic IP Address - IP addresses that change every time when connected to the internet.
Dynamic Languages - Programming languages such as PHP or ASP which build web pages on the fly upon request.