Latent semantic indexing (LSI) is one area in which search engine optimisation is a different creature in 2007, according to one expert.
Writing for Promotion World, Mike Bradbury says that LSI is a feature of search engine optimisation "that wasn't around last year".
Google has added LSI to allow it to establish a page's relevance to a particular search. Mr Bradbury uses the analogy of Jaguar - through LSI, Google is able to determine whether a search for the word brings up results relating to cars or to cats based on the kind of language used in the content.
For example, he says the search engine can tell from the presence of phrases such as "moon roof" or "ferocious cat" how relevant the web page is to the user.
In other Google news, The Mountain hosted more than 3.6 billion searches by internet users in the US in February, giving it a 55.8 per cent share of the search engine market.
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