Obfuscation
The act of misrepresenting meta tags or content. The user is presented with a
page that looks normal, but it is not the page submitted to search engines. This
is similar to cloaking or stealth pages, but it further protects the code by giving
 code stealers a micky page. The page often looks normal, but there will be
something wrong with it to cause it to rank low on search engines (things like
bad keyword density or meta tag errors). When someone steals a high ranking
page like this and installs it on their own server, they will never get the rankings
 the real page gets.
 

Open Directory Project
The Open Directory Project (ODP) is a site directory run by volunteer editors. This
is one of the great internet success stories of 1999. The ODP is used by Lycos,
Hotbot, AOL-Netfind, Netscape Netcenter, and the home base www.dmoz.org
itself. Currently there are around 700,000 hand picked and selected sites in the
 directory. The first edition of the ODP was known as NewHoo (a play on Yahoo).
Netscape provided server space for the NewHoo directory and it was collectively
renamed The ODP.

  Open Source
Open source software is software that is released with source code. People are
allowed to make dirivative works from open source software as long as it is
released under the same open source agreement.

  Open Text
A formerly large directory of businesses directory that is all but defunct now.

  Optimization
Creating a page that is specifically intended to rank well as search engines.
Basic optimization includes a descriptive paragraph of the site with keywords
near the top, avoiding frames and deep tables that have menus on them..