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Knowledge Graph    This article is about Google's specific implementation of knowledge graph technology. For knowledge engine technology in general, see Knowledge engine . Knowledge Graph data about Thomas Jefferson displayed on Google Web Search , as of January 2015. The Knowledge Graph is a knowledge base used by Google to enhance its search engine 's search results with semantic-search information gathered from a wide variety of sources. Knowledge Graph display was added to Google's search engine in 2012, starting in the United States, having been announced on May 16, 2012. [1] It uses a graph database to provide structured and detailed information about the topic in addition to a list of links to other sites. The goal is that users would be able to use this information to resolve their query without having to navigate to other sites and assemble the information themselves. [2] The short summary provided in the knowledge graph is often used as a...