A keyword, in the context of SEO, is a word used to find relevant results in Internet searches. You need to use appropriate keywords to optimise your web pages so that you can attract targeted visitors or potential prospects to your web site. Understanding how SEO works will help you to fine-tune your web content by making use of the specific phrases that most web searchers are likely to use.

Keyword Density. A keyword density is an indicator of the frequency of a keyword or the number of times a selected keyword appears on your web page. In other words, it is the percentage of words on a web page that matches a specified set of keywords. As applied to SEO, keyword density can be used as a factor to determine whether a web page is relevant to a specified keyword or keywords.

Search Engines. Google, Yahoo! and MSN and other search engines use advanced programming tools to find and present valuable search results. The technology uses algorithms to determine what web visitors might search for, and then matches those visitors with web sites offering what they are interested in finding. Search engines use robots, web crawlers or spiders, to index websites or web pages. A search engine web crawler is an automated program that is run by the search engine system to index web sites.

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