So, what is Latent Semantic Indexing?
LSI is a key phrase research technique that recognizes search engines (Google, MSN, Yahoo) use synonymic (multiple words with the same meaning) and polysemic Latent Semantic Indexing (single word with multiple meanings) variations of your key words when determining page rank of multiple sites for the same key phrase. In other words, when determining whether content on your web site should be considered as subject matter expertise and thus ranked well in the search engines as compared to other web sites for your key phrase, not only do the major search engines consider the key phrase you know about, they also consider their synonymic and polysemic variations Latent Semantic Indexing and how much your content uses them in relation to other sites. In addition, search engines use LSA (Latent Semantic Analysis) to determine key phrases outside your chosen niche that are relavent to your key phrase. Performing an LSI analysis on a local real estate niche might reveal, for example, that in ad
