| 1. | Dead Link | Broken Link. |
| 2. | Description | a summary of a web page's content, often used verbatim in search engine results pages. |
| 3. | Description Meta Tag | a meta tag describing the content of the web page. Used by some search engines for keyword density purposes.It is recommended that you use a couple of your targeted keywords in the description meta tag. |
| 4. | Directory | a categorised list of websites, maintained by human editors instead of robots. Yahoo is the most widely recognized directory on the web. |
| 5. | DNS Propagation | when a new domain name is registered (or an existing one is transferred to a new DNS), the information must make its way around the entire internet. This process usually takes around 24 hours, during which time the domain will be inaccessible to many or all users. |
| 6. | Domain Name Server | computer that translates human-friendly URLs (words)into computer-friendly IP addresses. This process occurs every time a user requests a page from a website. |
| 7. | Doorway Page | a page optimised for a particular search engine and/or search term, followed by a redirect to the usable page. Multiple doorway pages are often used to help ensure that the same basic content is ranked well on several different search engines. Frowned upon. (aka gateway page) |
| 8. | Duplicate Content | separate web pages with substantially the same content, which may attract a penalty from search engines. |
| 9. | Dynamic | Web page content that is generated dynamically from a database |
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