What protocol is used for data serialization during communication via gRPC?

gRPC uses the Protocol Buffers (protobuf) protocol for data serialization. It is a compact, fast, and efficient binary format that allows describing data structures and automatically generating code for different programming languages.

Example of a message description in protobuf:

syntax = "proto3";

message Person {
  string name = 1;
  int32 id = 2;
  string email = 3;
}

When exchanging data via gRPC, data is serialized into the protobuf format, ensuring high performance and compact transmission.