Everything gRPC (Part 1)

When people (Devs) first hear about gRPC, the usual description is that it’s a high-performance RPC framework built on top of HTTP/2, using Protocol Buffers. That’s accurate. But it doesn’t really help you understand anything. Because the real confusion doesn’t come from what gRPC is, it comes from how it actually behaves when you’re building with it. The moment you open a .proto file for the first time, it feels unfamiliar. You’re defining services, messages, fields with numbers attached to them. It doesn’t look like the typical request-response structure you’re used to with REST. And that’s where the shift begins. Instead of thinking in terms of URLs and JSON payloads, gRPC asks you to think in terms of contracts. The .proto file is not just a schema. It’s more like an agreement between two systems. It defines what can be said, how it should be said, and in what structure. Before any communication happens, both sides already understand the language. Those numbers you see attached to