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Dead Link: A Dead Link is a Hyperlink to a page that not working no longer exists from any more on your webpage or site cause of server is down and page has moved this problem is shown like HTTP Header Status code is “404”
Deep Link: Deep link that is directly link to another part of the site or link to the another web site home page and its Linking that guides, directs and links a click-through searcher to a very explicit and appropriate product or category web page from search terms and Pay Per Click ads.
Doorway Page: Doorway page is a technique which is specially uses for drive traffic and brings keywords into high ranking. Its not create any good information for human being just make for search engines optimization in order to rank high for very specific keywords this technique has been unnecessary this all techniques has been spam by search engines.
Database: Data base is a organization collocation of data and it’s a storage area of all information about web site and web site content.
Directory: A directory is a web site that restrains a lot of categorizes and arrange by a topic from where you can list your web site in the particular category which is related to your web site this techniques search engines likes so much.
Description tag: Description tag is HTML Tag appears in Meta tag which is describe the all information about webpage it’s not display on content page but it is inform to search engine that page crawl correctly.
DMOZ: DMOZ is known as Open Directory Project it’s a very popular directory and lots of human edited the web site in this directory. AOL Search engine owner of this directory.
Duplicate Content: As the name of Duplicate content you have be aware that the content which is already used in another web site either more than one web site or web page it’s a very negatively effected to search engines because search engines don’t like that page or content which is already used another site or another page cause seo value will be very low of duplicate page or content.
Dynamic content: Dynamical content known as that content which is change automatically and it’s depend on database and user information. Their are different types of dynamically url’s ends with .asp, .cfm, .cgi or .shtml
Domain Name: Domain name is as website address and URL as articulated in hypertext transfer protocol code.