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I used gRPC for numerous hobby projects during my undergrad to glue together binaries running in different languages (e.g. a simulation server running in C++ and a scripting client in Python). By passing around a shared data structure (Protobufs), one does not need to waste time writing serialization/de-serialization adapters. It is also useful for gluing together microservices.

FB's Thrift also solves the same problem, and is an alternative to gRPC.

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Going into the microservice aspect above, it provides a nice abstraction of remote function calls, so that you can write microservice code that looks like it's executing a local function, but is really just expecting a remote server to implement the method name. In general, that's just RPC calls though. Google's implementation has proven very intuitive to learn, and has a nice size community online for help debugging, etc.

Thrift mostly solves the problem of crashing a lot and being an undependable mess.

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