Term Kind Topic What it is
gRPC as a Transport protocol gRPC Transport A binary contract-first RPC protocol over HTTP/2 — efficient and strongly typed for internal service-to-service calls, awkward at the browser edge.
gRPC Streaming concept gRPC Transport Four call patterns — unary, server streaming, client streaming and bidirectional — built on HTTP/2 streams.
Protocol Buffers Protobuf protocol gRPC Transport A binary serialisation format with a schema definition language, generating typed code and enforcing explicit compatibility rules through field numbering.