gRPC & Protocol Buffers

https://grpc.io/about/
https://grpc.io/docs/what-is-grpc/core-concepts/

https://de.wikipedia.org/wiki/Remote_Procedure_Call
https://www.heise.de/developer/meldung/Alternative-zu-REST-gRPC-Web-jetzt-allgemein-verfuegbar-4202697.html

Protocol Buffers

https://developers.google.com/protocol-buffers/docs/overview
https://protobuf.dev/programming-guides/proto3/

Python

https://grpc.io/docs/languages/python/quickstart/
https://grpc.io/docs/languages/python/basics/
https://www.velotio.com/engineering-blog/grpc-implementation-using-python
A simplified guide to gRPC in Python