Strictly speaking, gRPC is a protocol built on HTTP/2 that allows you to create services easily. gRPC can use protocol buffers to specify an interface definition language, as well as to specify the format of the interchanged messages. gRPC clients and servers can be written in any programming language without the need to have clients written in the same programming language as their servers.
The process that will be presented here has three steps. The first step is creating the interface definition file, the second step is the development of the gRPC client, and the third step is the development of the gRPC server that will work with the gRPC client.