Definitions of Important SEO Terms:

SEO

SEO is an abbreviation of "Search Engine Optimizers," or "Search Engine Optimization" a word that was inherited by an growing fraternity of consultants who carry out optimization on behalf of web site owners. It also refers to is the process of improving the ranking or visibility of a web site or a web page in search engines through the non-commercial search results. The paid versions bsically rely on how much the individual web site owners pay to be ranked higher in relation to others and is entirely dependant from the factors that make web sites rank well.
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Keywords

These are the queries that a user enters into a search engine were the engine then examines its index and diplays a list of web sites that best match the key word according to the criteria of the said key words.

The search engine examines for the words or phrases exactly as entered whilst some will provide a "proximity search" which allows users to ascertain differences between suggested keywords.

The keywords are also the text entered on the meta tags of web page code as shown in the example on the right. The density of the keywords per certain amount of code is then calculated using very complicated inside the search engine's crawler and the resultant output is tallied against other features in order to come up with the final calculation of the relative position that a website will appear on that particular search engines search results.


Web Search Engines

A web search engine is are a mixture of algorithmic and human input designed to search for information on the World Wide Web and to list it as per enquiry.

The search results are generally presented in a list of results and are often called site-hits. The information may consist of web pages, images, information and other types of files. Some search engines also mine data available in databases or what is generally termed "open directories".

You can find out more on SEO Tips and Desfinition