Technically speaking, Latent Semantic Indexing (LSI) is a computer technology developed in the late 1980s to retrieve precise information from large sets of data. The computers use the Singular Value Decomposition process to find the correlation between different terms in a seemingly random set of data.
Is that too much jargon for you? Let us simplify.
LSI allows search engines to find the hidden relationships between different words in a document to understand its correct meaning. In other words, it enables computers to learn and understand any text just like humans do.
So, how are LSI and Search Engine Optimization (SEO) related to each other?
LSI allows search engines to understand your content and its context along with your search intent and its relationship to a specific keyword. As search engines can read your content like humans do, using relevant keywords will improve its chances of getting ranked higher in search results.
It is a well-known fact that Google is putting more emphasis on understanding the context of any piece of content. That’s how latent semantic indexing found use in SEO and is likely to prevail in the coming years.
I'd share the basic information about LSI, A good meta description is extremely helpful when it comes to SEO. Use your main keyword and an LSI (Latent Semantic Indexing) keyword phrase in your description and Google will give you more priority