Algorithm			Meta Tag
	Crawler			Mirror Site
	Keyword Density			Optimisation
	Directory			Outbound Link
	Doorway Pages			Paid Placement
	Filter Words			Paid Inclusion
	Inbound Link			Paid Submission
	Invisible Text			Search Submission Service
	Key Words			Spam
	Link Popularity			Spider
	Log-File			URL
	Meta Data

Algorithm
A mathematical formula used to determine the relative placement
or ranking of a web page within a Search Engine.

Crawler
A type of a spider that can follow the hyperlinks within web pages to catalogue the entire contents of a web site.

Keyword Density
The number of times your keywords appear on your web page in relation to the total number of words. Obviously the higher the keyword density the better, however suspiciously high keyword densities may be considered spam.

Directory
A directory is a type of search engine where inclusion and ranking are determined by human reviewers and not automatic spiders. They are usually harder to get into and rank highly in. Yahoo.com is the most well-known directory.

Doorway Pages
Doorway pages - also known as gateway pages - are designed exclusively to appeal to search engines promoting specific keywords pertinent to your companies services/products.

Filter Words
Filter words are common words that are ignored by search engines when cataloguing and ranking web pages. These include "the, is, and, of, for, do".

Inbound Link
A link to your website from another website.

Invisible Text
Including keyword rich text in a web page which is set to the same colour as the background colour to improve ranking. This technique is considered spamming and is easily detectable by Search Engine spiders.

Key Words
Words that are key to identifying your site content and that you wish search engine users to find you by.

Link Popularity
The number of inbound links to a particular web page. Many search engines use this number as part of their listing, placement, positioning or ranking process, for example Google.com.

Log-File
A file produced by a web server that tracks connections to a web site. Referral logs are the main way that a web administrator can identify which search engine visitors have used to reach their web site.

Meta Data
The information contained within Meta Tags.

Meta Tag
Special HTML tags at the beginning of a web page which give abstract information about the content and purpose of that page. All search engines use these tags as part of their listing, placement, positioning or ranking process.

Mirror Site
A shadow duplicate copy of a web site at a separate URL in order to spread out the resource load on a server. Mirror sites are difficult to get indexed properly by search engines as they may view the duplicate pages as spamming.

Optimisation
Optimisation, in the context of Search Engines, is the process of creating or making changes to a web page or web site so as to maximise the positioning, placement, ranking, or listing of that page or site with one or more search engines. The ultimate goal is to help potential customers or visitors find a web site.

The optimisation process involves studying the way search engines rank pages and then making the web page "search engine friendly." Each search engine computes this with a different formula or algorithm that changes frequently. Optimising also involves researching and selecting keywords that are the most likely words and phrases a potential customer would use to find you.

Outbound Link
A link from your website to another website.

Paid Placement
A paid for submission to a search engine which guarantees a top placement within that search engine. Usually paid for by the click. Not all search engines accept paid placements.

Paid Inclusion
A paid for submission to a search engine which guarantees listing within a search engine but does not affect relative placement within that search engine. Not all search engines accept paid inclusions.

Paid Submission
A paid for submission to a search engine that guarantees that a website will be reviewed/spidered within a set amount of time but does not guarantee placement or that the site will be listed at all. Not all search engines accept paid submissions.

Placement
Your placement on search engines - where your site appears in relation to similar sites when a search is performed

Rank / Ranking
Same as Placement.

Search Submission Service
A service that will automatically submit your page or web site to many search engines and/or directories at once.

Spam
The use of unethical and/or misleading optimisation techniques to artificially increase the placement of a web page within a search engine.

Spider
A computer program which is used by search engines to automatically review and rank web pages.

URL
Universal Resource Locator. Essentially the web address of a web page.