Database-driven – A database-driven website is a website that includes information that is driven from a database, instead of using static HTML pages.

Database-generated – A database-generated website is a website that is created in a dynamic way, loading information from a database, instead of using static HTML pages.

Deep submitting– Deep submitting is the act of submitting to search engines and directories pages that are located deep in your site. This is a controversial SEO off-page factor – while doing this for the most important pages of a site is a good thing, doing it for hundreds of pages may be considered spam and result in a heavy penalty.

Directory – A directory is a human maintained collection of links, sorted on different categories and subcategories. Since all sites are approved by a human editor generally the quality of the sites in a directory is quite high. The most important free directory is DMOZ (www.dmoz.org) and the most important paid directory is Yahoo Directory (dir.yahoo.com).

Doorway page – A doorway page is a page that has no real content and is only used to link / redirect to a web page. It was one of the most efficient black hat SEO tactics in the past, but it has no real effect nowadays. It is also called a bridge page.