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Google Universal Search is an attempt to utilize all Google services in presenting search results data. Universal search (also known as blended, or federated search results) serves search results data from multiple databases in order to display results on the same page. It pulls data from Google services such as: websites search, images, news stories, product information, video, local, maps, patent search, blogs, code search, finance, scholar and book search engines.

It was introduced on May 16, 2007 and since then developed and made available in other language versions of Google search engine than English.

The ultimate goal of universal search is to break down the silos of information that exist on the web and provide the very best answer every time a user enters a query - Marissa Mayer, vice president of search products and user experience at Google.

With universal search, we’re attempting to break down the walls that traditionally separated our various search properties and integrate the vast amounts of information available into one simple set of search results - Official Google Blog.

Google have been developing specialized ,or vertical search engines dedicated to certain vertical niche of the market. Unfortunately many users did not realized their existence and its power. Google decided to blend results from all those search engines into one search engine making it available for all users, even those who dont know the existance of separate search engines for specific vertical.

Google OneBox results is the visible outcome of the universal search but its not universal search itself. Let me explain to you:
Google OneBox aims to remind users that Google also developed a vertical search engines and uges user to use this particular search engine, when Google analysis the user search query and decides that a vertisal search engine would search better results compared to “general” search engine.

Universal search results are implemented into “notmal” search results on appropriate positions:

While the OneBox hasn’t entirely gone away, it has been replaced in many cases by blended results in relevant positions. As we continue development, we’ll continue to evolve our use of both the OneBox and blended results to deliver the most relevant results - Google.

Universal search introduces also the comparative ranking. When a user types a search query Google analysis the results from Web search engine versus vertical search engines. If the vertical search results are deemed more relevant to the user query, then the are added to the results instead of the web search result.

The blending part of universal search is about inserting results from Google’s vertical search engines into the “normal” results. For example news stories may be added to a search results page if a search query correlates with the appropriate news story in order to present up to date information to the user, who might not know about the news before.