The ‘edge’ refers to computing infrastructure that exists close to the origin sources of data. It is distributed IT architecture and infrastructure where data is processed at the periphery of the network, as close to the originating source as possible… More here.
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McGST 
Sigh. Like many things in IT, these are new names for things that have existed for many years. The technology has improved of course, and much more real time data processing is possible, but the concepts and basic implementation is not new. And I’m talking decades, not just a few years. I remember a customer we had who did data collection and processing on the shop floor to track manufacturing processes using bar codes (the Edge). The data collected was fed into corporate computers (the Fog) and also on servers off site (the Cloud).
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