We develop keyword optimized content with a focus on keyword density.
There was a time in SEO when a keyword density of 5-10% were common. That meant that for every 100 words, the keyword would me used 10 times.
Things have changed and now we aim for a keyword density of 1-2%.
Latent Semantic Indexing
LSI produces content that is themed around a common topic. Themed content gives people something they are more comfortable with, and it gives the search engines exactly what they want as well.
Properly themed content contains a rich mix of related terms that, over time, gets ranked for dozens, and even hundreds of different words and phrases, each one relevant to the basic topic or theme of the article.