Keyword density is an indicator of the number of times the chosen keyword comes out in the web page. But mind, keywords shouldn’t be over practiced, but should be just decent enough to appear at essential places.
If you repeat your keywords with every other word on each line, then your website will likely be declined as an artificial internet site or spam website.
Keyword density is always expressed as a percentage of the total word content on a given web page.
Suppose you have 100 words on your web page (not including HMTL code practiced for writing the web page), and you use a particular keyword for 5 times in the subject. The keyword density on that page is got by simply dividing the total number of keywords, by the total total of words that come out on your web page. So here it is 5 divided by 100 = .05. Because keyword density is a percentage of the total word count on the page, multiply the above by 100, that is 0.05 x 100 = 5%
The accepted standard for a keyword density is between 3% and 5%, to get recognized by the search engines and you should never exceed it.
Remember, that this rule applies to all page on your site. It also applies to not just to one keyword but also a set of keywords that links to a different product or service. The keyword density should constantly be between 3% and 5%.
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It is the search engines that at last bring your web site to the notice of the prospective customers. Hence it is better to know how these search engines actually work and how they present data to the customer initiating a search.
There are basically two types of search engines. The first is by robots addressed crawlers or spiders.
Search Engines use spiders to index websites. When you submit your web website pages to a search engine by completing their demanded submission page, the search engine spider will index your entire web site. A ‘spider’ is an automated program that is run by the search engine system. Spider visits a web website, read the content on the actual web site, the web site’s Meta tags and also follow the links that the site connects. The spider then delivers all that data back to a central depository, where the data is indexed. It will visit each link you have on your internet web site and index those sites as well. Some spiders will only index a certain number of pages on your web site, so don’t create a website with 500 pages!
The spider will periodically return to the sites to check for any data that has changed. The frequency with which this happens is determined by the moderators of the search engine.
A spider is almost like a book where it contains the table of contents, the actual content and the links and references for all the websites it finds during its search, and it may index up to a million pages a day.
Example: Google, Yahoo, Bing, AltaVista and Lycos.
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