gRPC is a method of web communication between services, it is kind of an Api. It responds the requests acroos the web and give responds to the caller back the requested information. The differences are how it is set up and how it transports are the big differences. gRPC relies on a known configuration that is shared between the client and the server. It is like a contract. These contracts are called protocol buffers the other big differences between gRPC and Api is that gRPC communicates using a binary stream this is much more efficient than a web server which can use JSON or XML.
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