Latent Semantic Indexing (LSI) is a system used by Google and other major search engines (Update: read here, thanks for the Tweets, guys) The contents of a webpage are crawled by a search engine and the most common words and phrases are collated and identified as the keywords for the page.
LSI (Latenet Semantic Indexing) is used by google and different search engines which can check the last updated website details. You can search on Google and there will be a small arrow next to the URL and then click on cache. You will find the details.
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