Keyword Density is the percentage of occurrence of your keywords to the text in the rest of your webpage.It is important for your main keywords to have the correct keyword density to rank well in Search Engines.
The preferred keyword density ratio varies from search engine to search engine. In general, I recommend using a keyword density ratio in the range of 2-6%.

I heard it from somewhere that 1-3% is ideal keyword density, but i always use to keep it within 1-8%.






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