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Key phrase (or keyword phrase) -

A search phrase made up of keywords. E.g. 'luxury hotel accommodation Paris'

Keyword Density -

The more times that a given word appears on your page (within reason), the more weight that word is assigned by the search engine when that word matches a keyword search done by a search engine user. Keyword Density = Total number of keyword occurrences on a page/Total number of words. Most experts agree that 4-8% should be the maximum keyword density.

Keyword Domain Name -

A technique that helps in getting top search engine ranking wherein a domain usually has all target keywords embedded in the domain name. The keywords are usually separated by hyphens. An example would be www.buy-blue-red-green-cheap-widgets.com

Keyword Popularity -

The number of searches for a specific keyword during a given period of time. Both WordTracker.com and Overture's Search Term Popularity Tool (http://inventory.overture.com) provide keyword popularity numbers.

Keyword Prominence -

The specific location of keywords in a web page. The higher up in the page a particular word is, the more prominent it is and thus the more weight that word is assigned by the search engine when that word matches a keyword search done by a search engine user.

Keyword Research -

Determining the words and phrases that people use to find something, then compiling them into a list for use on web pages, etc.

Keyword Stuffing/Spamming -

The practice of placing excessive amounts of keywords into the page copy in such a way that it detracts from the readability and usability of a given page for the purpose of boosting the page's rankings in the search engines. This includes hiding keywords on the page by making the text the same color as the background, hiding keywords in comment tags, overfilling alt tags with long strings of keywords etc.

Keyword-Rich -

When a given page or bit of text is full of good keywords rather than a bunch of meaningless words (e.g. "welcome", "click here") or irrelevant words (e.g. "solution").

Keywords -

Words used to find relevant web page(s). eg 'accomodation' If a keyword doesn't appear anywhere in the text of your web page, it's highly unlikely your page will appear in the search results (unless of course you have bid on that keyword in a pay-per-click search engine).