What is theme relevance? Is this your first time that you heard about it?. When you are in an online business you are competiting with your competitors and sometimes you follow their steps, building links as much as they have and much more. But as I mentioned many times, Backlinks is ONE important factor and theme relevance is another important factor to get higher rankings and beat your competitor.
How many times you heard about the wars that search engines are doing between them. Google now is the #1 Search engine and the most used. They are competing with the market share and they want as many eyeballs like you on their search engine (index) to increase exposure for their advertisers so like this they will have billions of dollars and increase their stocks. That is one of the reasons why search engines make drastic changes in their algorithm so they can give the best accurate results.
That’s why theme relevance is important to them. If you start building backlinks with high authority sites you may rank very well but when they change their algorithm you may get dropped and your online business is bankrupty (In case you put your eggs in search engines, which 99.9% of us do).
When you start an online business (any type of site) to make money online you have to create a solid base and follow search engine rules. How we can do that? How Google determines the theme of your site? The answer is Latent Semantic Indexing (LSI).
I will publish more articles and guides about What is Latent Semantic Indexing with some examples so you can understand it very well and start creating relevance theme sites.