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Normally from child to well versed professors, all are using Google for searching all the each and every need in their life. If you want to know about any information first your mind decides to search in Google. If you type the word or a question or a phrase , it will list all the links which is related to your search. Each link will be directed to different websites, which was posted by the site admin.
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Some sites will have more information, some may not satisfy your search. So if you want to know about the sites, here are some details about that features which was introduced by Google itself.
There will more page name next to your actual link, which one you are searching for, that page name will contain more information about your search. While searching, the result of all the links will be in blue or purple colour (already visited). Below there will be a green link name and next to it there will be page name in gray colour. This gray colour name will have a short information about the page.
But this feature is only for few pages which was mostly used. Google says that, if the site is widely recognised or viewed in online, then only it will show up this description. All the information in the Google is derived from Google knowledge graph. So Google is hoping to increase the website description. Google displays website description with wiki link.