What is the best keyword density?

Many SEO seniors have answered this question. The answers are: 2-8%, 3-7%, less than 10%, about 5%, you choose one yourself. Keyword density is a vague concept rather than an absolute.

The higher the keyword density, the better. With the following explanation, you may understand what keyword density means?
The workflow of a search engine is roughly like this:
Index the web page. This is Robot's job. Search robots are very diligent, so being included is the easiest thing. (But many people are always complaining: Why is my site not included?)
Category and archive web pages according to keywords.
Sort all web pages within a keyword archive. This involves domain name PR value, link anchor text, etc.
For popular keywords, a static page is generated on the first page of results. (If you don’t understand this, skip it)
The second point is that the search engine determines the words in the web page content that meet the keyword density standards as the keywords of the web page. So, what does keyword density mean? If the keyword density is not determined, it is impossible to rank at the third point.

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