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gRPC (Remote Procedure Calls) is an open source Remote Procedure Calling (RPC) system originally developed at Google in 2015. It is a variant of the RPC architecture, created by Google to speed up data transfer between microservices and other systems that need to interact with each other. Compared to the REST API, the rpc API is unique in the following ways: Built on HTTP 2 instead of HTTP 1.1 Protobuf instead of JSON. Message transmission is 7-10() times faster.