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DHTML (Dynamic HTML) – A marketing term used to describe a series of technologies introduced in Version 4.0 Netscape and Microsoft browsers to enhance the dynamic capabilities of the browsers. Web pages designed for DHTML include HTML tags, CSS and scripting languages which enhances the interactivity and visual appeal of Web sites without requiring the use of plug-ins.

Dead links (Broken links) – Links that no longer reach a webpage.

Delisted – Pages that are removed (and perhaps banned) from a search engine’s index.

Directory - Collection of links to Web sites organized by categories; usually added manually through an editorial selection process.

Domain name – Naming convention assigned to an IP address.

Doorway page –Web page designed for the sole purpose to rank well in a search engine’s index but automatically redirects human visitors to the main content page. Treated as spam by most search engines and is not recommended unless necessary for paid inclusion programs.

Double opt-in (Permission marketing) - Visitor submits an electronic request to be added to an email list or discussion forum and then verifies request by responding to an email confirmation.

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