What is gRPC?

gRPC is a high-performance Remote Procedure Call (RPC) framework.
gRPC enables efficient and simple communication.
Microservices are built using different languages, and a lot of information is exchanged between them. So gRPC is used to communicate between these microservices.
gRPC is language agnostic.
By default, gRPC uses Protocol Buffers (although it can be used with other data formats such as JSON).

Protocol Buffers
- Protocol buffers provide a language-neutral, extensible mechanism for serializing structured data. It’s like JSON, except it's smaller and faster, and it generates native language bindings.
- Protocol buffers are a combination of the definition language (created in .proto files), the code that the proto compiler generates to interface with data, language-specific runtime libraries, and the serialization format for data that is written to a file (or sent across a network connection).
- Some of the advantages of using protocol buffers include:
  - Compact data storage
  - Fast parsing
  - Availability in many programming languages

It works just calling a normal function.
Client/service has a generated stub that has the same methods as the gRPC server.
These stubs call the gRPC under the hood to exchange information so that we can focus on the core logic.
gRPC uses HTTP/2 as communication transfer protocol:
- Faster
- Lighter to transport
- Robust and performant
- Multiplexing multiple requests and responses over a single TCP connection.
- Server push (single request from a client, multiple responses from server)

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