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KQL specifies a syntax for search queries that enables users and application implementers to formulate search queries in a structure that resembles natural language and at the same time allows the specification of Boolean matching rules on text and properties of the searched items

KQL is the default query language for building search queries. Using KQL, you specify the search terms or property restrictions that are passed to the SharePoint search service. http://msdn.microsoft.com/EN-US/library/office/ee558911(v=office.15).aspx