Latent Semantic Indexing (LSI): What it is, how it works and what it means

[mandy]

LSI is a methodology for automatic document classification.

It can gauge very accurately which documents in a corpus are really relevant to a search phrase even if that search phrase does not appear in a document. Measuring relevancy is a key component of a search engine's ranking algorithm. When search engines use it, LSI can have a significant impact on the ranking of your web pages.

What this means for the search engine optimization (SEO) specialist and anyone with a website who wants high visibility in the search engines is that every word on your web page is important, not just the keyphrase(s). ..

full article: http://www.searchengineguide.com/marshall/005944.html