LSI is the process by which Search Engines infer what a pages is about based on words and phrases other than the official keywords of that particular page by considering the latent semantic content of the text. The idea behind the approach is to minimize keyword stuffing. LSI allows you write about anything without mentioning the keyword more than once or twice.
Latent Semantic Indexing is meant to allow a more natural approach for search engines to view and rank websites. The principles of LSA to determine the content of web pages were used by a small company called Oingo that changed its name to Applied Semantics who developed a search system to determine the relevance of page content for specific advert placement. They called this Adsense. This company was in turn bought by Google in April, 2003, and Adsense used to replace their own system which was still under development. Adsense, then, was not developed by Google, but purchased by them.
LSI is about words, keywords usage and their placement with the page content and form sentences so that Google is able to get an idea what the web page actually wants to convey to the users. The technique helps a page to rank for search phrases related not only to the keywords but their synonyms also. Using the Latent Semantic Indexing concept, a web page about music could also include related words such as radio, mp3 players, ipods and so on. Rather than repeating the same words throughout the site, a wider variety of text and phrases can be used for keywords and search phrases.
If we take the example of "SEO", the LSI algorithm will look for SEO related terms like Search Engine Optimization, Website Optimization, Web Promotion, Search Engine Marketing and so on. This also helps in increasing relevant search results and decrease search engine spam.
A simple method to get an idea of the synonyms and the equivalent words considered by Google for any particular term is to use the tilde (~) in Google search for the keyword. For example, if you search for “Phone”, the first result you get is that of Nokia. IT means that Google considers Nokia as the synonym of phone.
Latent semantic analysis and indexing is used by Google primarily to detect spam to determine the page theme and its relevancy. It is also used to determine the true meaning of homonyms, heteronyms and polysemes. The technique is used to determine the difference by means of analysis of the other words in the text.
The web pages on your web site should be related and focus mainly on a special topic while using different words that describe the topic. Use variations of your keyword and synonyms. That makes it easier for search engines to determine the topic of your site.
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