What is Latent Semantic Indexing?
It’s easiest to think of latent semantic indexing (LSI) as ‘word association’. Back just a year or two ago, Google used to look for keywords in your text, and in order to rank well, you needed to have your specific keyword in the appropriate elements of your post, repeated to within 2 – 4% density in order for Google to apply relevance of your post to the specific keyword.
Things have changed during 2012 and into 2013 however, with the invention, creation, development of LSI.
LSI allows Google to better understand your content, by associating words that are related, so now for example, Google knows that ‘bedding’, ‘Duvet’, ‘pillows’, ‘sheets’, ‘linen’ are all closely related to the same topic.
Now, instead of squeezing in your chosen keyword to 2 – 4% density, you can write your content in a much more natural ‘human’ style and Google bots will understand that with a much lower keyword density what your page content is all about.
Read more about LSI here http://en.wikipedia.org/wiki/Latent_semantic_indexing
How to Use LSI
Because Google can now associate the keywords that you use that are related to each other, it is much better equipped to assess your website content for congruence from top to bottom, without the need for you to shoehorn your keywords into the content.
This improves the user experience because you can now write your content with the human end user in mind rather than keeping an eye on what Google thinks of your content.
The key to making LSI work for you then is to use related phrases in your content rather than just using your main keyword or phrase in order to rank for that search term.
The same rule applies to link building, always use related phrases where possible in your link text so that Google sees a large variety of different search terms being used to link to your content.
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