Similar or related content make up a 'theme' for the site, search engines uses it to figure out to categorize and rank the site in the index.
For example, you are building a automobile website, naturally there should be sub sections like cars, bikes etc. in it. that is somewhat related to the main topic of the site, having a section like web hosting in the automobile site may sound a little weird.
The stronger the site theming, the more love you will be getting from search engines.
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