The A-Z glossary of search engine optimization terms and definitions. Adwords - A system to advertise on Google & partner sites on a CPC (cost per click) basis.
Agent Name - Synonymous with "User-Agent". This is the name of a spider or browser as defined by the owner.
Algorithm - A mathematical formulae which is used in order to rank websites and web pages.
Altavista - One of the first large scale search engines.
Back Link - A link from one website to another.
Bridge Page - Similar to "Doorway Page", this is a specifically designed entry point for a website.
Click-Through - A click on a link that leads to another website.
Click-Tracking - The use of scripts in order to track inbound and outbound links.
Cloaking - Delivering different content to specific crawlers/spiders. This is generally used to trick spiders into seeing optimized content.
Comment Tag - A tag in HTML that is invisible unless viewed through the source code.
Counter - A program or script that counts hits/visits to a page.
CPA - Cost per Action. Where you pay for a specified action such as a purchase.
CPC - Cost per Click. With this you are charged for every click your link on someone's website receives.
CPL - Cost per Lead. Where you pay for a lead i.e. is someone does something.
CPM - Cost per Thousand. Where you pay for each 1000 impressions.
Crawler - A program that goes through websites and gathers information for the crawler's creator.
Cross Linking - Multiple sites linking to each other.
CSS - Cascading Style Sheets. Used to manipulate and easily manage the design of a website.
CTR - Click Through Rate. The ratio of impressions shown to the number of clicks.
Dead Link - A link that produces a 404 error, page not found.
Directory - A website that list other websites in their various categories.
Domain - The name for a website e.g. SEOChat.com.
Dynamic Page - A page that generates content "on-the-fly" as a user requests the page.
Error Log File - A server log file which records errors encountered.
Google Everflux - This denotes the continuous changes in the Google search results pages.
FFA Free For All - This is a links page with nothing but links added by visitors.
Freshbot - This is the name for the Google crawlers that are known to add pages to the Google index more promptly than others.
Search Optimization 
