Old-school search engine techniques approached keyword searches with sort of an accountant mentality: a word is either found in an article / on a web page or it is not, there is no middle ground.
In addition to indexing the sites that DO contain a specific keyword, Latent Semantic Indexing looks at an entire collection of documents as a whole, that means a subsection of your website, your entire website, and sometimes even your website and several other websites that have multiple links to yours.
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