The recent changes at Google SERPs have brought a focus on LSI: Latent Semantic Indexing among the many seo 
professionals and business owners. It is an approach to understanding keywords in the context of the words on the entire webpage.
In addition to relying on keywords on a web page, Google now applies LSI technology to identify the words that has relevancy to one another. For example, LSI can discover relevancy between the words ‘Iraq’, ‘George Bush’ and ‘Saddam Hussein’ for the search term ‘iraq war’.
For LSI, Context is the King. Next time, when you optimize a page, make sure that you focus on relevancy and context.
More LSI Resources
- Latent Semantic Indexing (LSI), by Clara Yu, et al., National Institute for Technology and Liberal Education, January 1, 2002. http://javelina.cet.middlebury.edu/lsa/out/lsa_definition.htm
- MOLE: Text Analysis Group, THOR Center for Neuroinformatics, Section for Digital Signal Processing. http://isp.imm.dtu.dk/thor/projects/multimedia/textmining/
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