What are LSI keywords? Are they relevant to SEO?

 Latent semantic indexing (LSI) is a system search engines use to analyze the other words people use surrounding a given topic. 

LSI keywords are words and phrases with a high degree of correlation to your target topic. Google's algorithm uses them to help determine content quality and relevance to the search term.



I've seen a number of posts refer to LSI keywords as synonyms of the target keyword, but this is misleading. It's more accurate to say that they are the words that are most commonly correlated with the search in high-value content. That includes synonyms, but a great deal more as well.

At this point, LSI keywords appear to be more important than keyword density in search engine algorithms,

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