Quote:
Originally Posted by shilpa
Latent Semantic Indexing (LSI) is an indexing and retrieval method that uses a mathematical technique called Singular value decomposition (SVD) to identify patterns in the relationships between the terms and concepts contained in an unstructured collection of text.
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This is not very understandable and can also be browsed through google by the poster as it has been taken from wiki-pedia.
Lsi is basically synonymous keywords or related keywords to your primary keywords in your webpage's text content.