LSI or Latent Semantic Indexing Keywords are search terms that are conceptually related to the main search query. Search engines use a system called LSI, the method that not only determines a set of words that must be present in a text but also determines the number of repetitions. Based on these repetitions, search engines can establish how important each word is and how to rank your content for every search phrase. Latent Semantic Indexing or LSI keywords can improve your SEO. Learn how to implement LSI keywords and understand the advantages of lsi keywords.