Search Engines and Latent Semantic Indexing (LSI)
In the last unit of the course, we offered a basic overview of how search engines work. In this unit, we are going to take a more in-depth look at search technology, explaining some of the innovations that have been made to help return relevant results for search queries. In particular, we will be looking at some of the factors involved in Latent Semantic Indexing (or LSI for short).
Because of its very nature, beginners may find the material in this unit quite advanced, so you are encouraged to take your time and try to absorb the main points. We have also provided footnotes and suggestions for further reading. You are not required to read this material, but more advanced webmasters may find some of the sources mentioned useful.
By the end of this unit you should be able to:
- understand the basics of Latent Semantic Indexing
- understand how a search engine sees documents
- understand how a search engine weights keywords
This unit assumes that you have read the previous parts of the course and are familiar with major search engines such as Google.
3.1 Another look at search engines
SEO requires quite a lot of background knowledge if you are going to optimise your page in a manner that is effective and does not actually damage the ranking of your website. Before you even get your hands dirty altering the code on your web pages, you need to do quite a bit of research into the most effective keywords to use for your product or services and into the competition you face in search engine rankings. However, even prior to this, it is necessary that you understand a bit about:
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