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Key-based routing (KBR) is a lookup method used in conjunction with distributed hash tables (DHTs) and certain other overlay networks. While DHTs provide a method to find a host responsible for a certain piece of data, KBR provides a method to find the closest host for that data, according to some defined metric. This may not necessarily be defined as physical distance, but rather the number of network hops.<ref name="urlP2P Networking and Applications - John Buford, Heather Yu, Eng Keong Lua - Google Książki">Template:Cite book</ref><ref name="urlDistributed and Cloud Computing: From Parallel Processing to the Internet of ... - Kai Hwang, Jack Dongarra, Geoffrey C. Fox - Google Książki">Template:Cite book</ref><ref name="urlMedical Imaging Informatics - Google Książki">Template:Cite book</ref>