What is the purpose of the gRPC protocol and in which scenarios is it used?

gRPC is a modern high-performance RPC protocol developed by Google. It uses HTTP/2 for transport, which provides multiplexing streams, header compression, and a binary data format.

The main purpose of gRPC is to simplify interaction between distributed services by providing a strictly typed contract via Protocol Buffers (protobuf).

Use cases for gRPC:

• Microservices architecture requiring efficient and fast communication.
• Real-time systems where low latency is crucial.
• Mobile and web applications needing compact and fast data exchange.
• Systems with limited resources where traffic optimization is important.

Example of a service definition in protobuf:

service UserService {
  rpc GetUser (UserRequest) returns (UserResponse);
}

This approach allows automatic generation of client and server code in various languages.