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They have leveraged existing knowledge graphs, such as DBpedia and Freebase, and also have opened up the process of contributing to the graph by ingesting RDFa and microdata formats from the web pages they index, based on the vocabularies published by schema.org.  The success of the Google Knowledge Graph, and its use of semantic technologies, has led to a resurgence in the use of the term in semantic research to describe similar projects.  However, the term ``knowledge graph'' remains underspecified, and in many cases, simply refers to any directed labeled graph.  We surveyed both and synthesized  current literature on knowledge graphs and the historical use of the term and found some consistencies between current and historical use. term.  The pre-semantic web conceptualization of knowledge graphs provides us with guidance as to what might currently ``count'' as a knowledge graph, but also points towards future possible uses for current resources.  We used From  this overview to establish synthesis, we propose  an updated definition and requirements for along with a set or  knowledge graphs, and also address graph requirements We include  an implicit requirement: that knowledge graphs represent knowledge, as opposed to bare assertions with no justification or provenance. We discuss how knowledge graphs as defined are a crucial component of the future of the web and have great potential for transformational change in data science and domain sciences.  %\end{abstract}