Popular knowledge graphs, which are used by consumers, have established high expectations for search systems within businesses. Examples of these knowledge graphs include: DBpedia: a graph of information extracted from Wikipedia. YAGO: a large knowledge base with general knowledge about people, cities, countries, movies, and organizations. Freebase): a graph of general knowledge (discontinued) but worth learning its history. Wikidata: a graph of structured data from Wikipedia and other sources. Google Knowledge Graph: a graph of information used by Google to enhance search results. Microsoft Satori: a proprietary graph of knowledge used by Bing and other Microsoft services. Amazon Neptune: a fully-managed graph database service that makes it easy to build and run applications that work with highly connected datasets.