The basic idea in SEO is that a website that is enriched with content with relevant keyword rich which people is searching will have higher rank in the search engines, as compared to a website that doesn't contain keyword enriched content. The keyword rich content is also instrumental in bringing better traffic to a website by improving its ranks in the search engine result pages.

Search engines determine the quality of a web page with the keywords that are used there and the positioning of the keywords. This is the reason as to why keywords density is important in a web page. Usually, the density for important keywords should be 5-6 percent and for not so important keywords the density should be around 2-3 percent.

In a website, the home page plays an important role in bringing traffic to a website. However, other pages also help in bringing traffic. Therefore the keywords for home page should be chosen very carefully. Here, the density should be good, but it should not be exceed 5-6 percent for each keyword. This is because, if the density exceed more than 5-6 percent, the content can get spam, which not good for any website.

There are several tools that can help finding the keywords that should be used in the content. These are the tools that will find the relevant keyword density of a keyword in an article or content. The main thing one should remember is that the keywords should be placed properly in the content. Because, search engines check for proper placement of keywords.

Also keywords should be chosen very carefully. The keywords should be the words that most common people will use to find their desired web pages in the search engines. Therefore, keywords are the basic things that need ones special attention while creating the content of a web page. There are also free tools for searching proper keywords for any web page.
These free tools provide the frequency of a particular word that most people are using to find content. They sometimes also suggest the appropriate keywords. The higher the frequency of the keywords means higher is the importance and more should be the keyword density of that keyword.

Moreover, one should always optimize the content for more than one keyword, since traffic of your website is determined by the number of keywords for which the website has been optimized.