What is a good keyword Density Percentage

How much keyword density is better?

Many SEO predecessors have answered this question. The answer are: 2-8%, 3-7%, less than 10%, about 5%, you choose a bar. Keyword density is a vague concept rather than absolute. Why? I once saw a site where a keyword density of more than 10%, and in particular the front rank, now, should be regarded as secret ...

Keyword density is much better?

Many SEO predecessors have answered this question. The answer are: 2-8%, 3-7%, less than 10%, about 5%, you choose a bar. Keyword density is a vague concept rather than absolute. Why? I once saw a site where a keyword density of more than 10%, and in particular the front rank, now, should be considered excessive density.

Keyword density is not as high as possible, the following explanation, you might understand keyword density mean?

Search Engine workflow is probably this:

1. pair of pages indexed. This is Robot job search robot very hard, so to be included is the easiest thing. (But there are a lot of people always complaining: I can not stand how it was included?) 

2. webpages are categorized by keyword archived. 

3. for all pages within a keyword archives sorted. Here it comes to domain PR value, link anchor text and so on. 

4. for the popular keywords, the results of the first page to generate static pages. (Do not understand this point, skip)

Where the second point, the search engine keyword density to meet the standards in terms of web content, determine the keywords for that page. So, what keyword density mean? If you do not determine a good keyword density, it is impossible to have a third point in the rankings.