Okay, let me tell you in simple words instead of confusing it with fancy terms.To understand gRPC, it is crucial to understand Protocol buffers and RPC.

Think of protobuf as a way to format data, much like CSV, XML, or JSON. The key difference is that Protobuf encodes the data in a compact, binary format instead of human-readable text like JSON. This makes it faster and more efficient when sending data over a network.

While RPC(Remote Procedure Call) is an API architecture style where client calls a function from remote machine as if it is its local function. You can read more about it here : Modern API architecture styles.

Now, gRPC is a communication protocol developed by Google that combines these two technologies. It uses Protobuf to serialize data and RPC to let different services talk to each other across networks seamlessly.According to its official documentation, we can also use gRPC with JSON instead of Protobuf. gRPC is designed to be fast, reliable, and efficient, making it perfect for modern, high-performance applications, like microservices, mobile apps, and real-time communication systems.