grpc.io/content/en/docs/protoc-installation.md

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Protocol Buffer Compiler Installation Protoc Installation How to install the protocol buffer compiler. 25.1 true

While it is not mandatory to do so, gRPC applications often leverage Protocol Buffers for service definitions and data serialization.

The protocol buffer compiler, protoc, is used to compile .proto files, which contain service and message definitions. For instructions on installing protoc, see the Protobuf.dev web site.