LSI also known as Latent Semantic Indexing are the keywords that are deeply related to a webpage content. These keywords or phrases are used when it comes to categorizing a page’s topic. LSI uses natural language processing (NLP) techniques to make good use of these kinds of keywords. The NLP technique renders the related words and phrases to index your website in top search results of a search engine. Subsequently, it increases the on-site traffic and helps in building a reliable customer base.