This is the word or phrase, which users enter into search engine. Hence, it is useful to target keywords, which are more likely to be searched.
This basically describes the repeated use of the same keyword across different web pages within the same site. However, this technique makes it more difficult for search bots to determine which page will be the most relevant for that keyword.
This measure gives the percentage of a keyword that appears within a page.
This research is required, in order to discover all relevant and high quality kewords and phrases to target in your campaign.
Excessively high keyword density