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LSI stands for Latent Semantic Indexing. Latent Semantic Indexing keywords can make your content look more natural to search engines and users. Instead of using the exact phrase repeatedly throughout your text, you can use synonyms and other terms that are related to your content and have the same meaning with your target key phrase.

Latent semantic indexing adds an important step to the document indexing process. In addition to recording which keywords a document contains, the method examines the document collection as a whole, to see which other documents contain some of those same words. LSI considers documents that have many words in common to be semantically close, and ones with few words in common to be semantically distant. This simple method correlates surprisingly well with how a human being, looking at content, might classify a document collection. Although the LSI algorithm doesn't understand anything about what the words mean, the patterns it notices can make it seem astonishingly intelligent.