gRPC is a modern open-source framework for remote procedure calls, designed to make communication between services in distributed systems fast, reliable, and easy to use. Originally developed at Google, gRPC was created to address the growing need for efficient, language-agnostic communication as organizations moved toward microservices architectures. In these environments, different services—often written in various programming languages—need to interact seamlessly, exchanging data and invoking functions across network boundaries.

The motivation for gRPC stems from the limitations of traditional communication methods. As applications scale and become more complex, simple HTTP APIs and custom messaging solutions can introduce inefficiency, complexity, and interoperability challenges. gRPC offers a solution by providing a framework that supports multiple programming languages, high performance, and a standardized way to define and implement service interfaces.

Remote Procedure Calls (RPCs) are a foundational concept in distributed computing. RPCs allow a program to execute a function or procedure in another address space—commonly on a different machine—just as if it were a local call. gRPC implements RPCs using two key technologies: HTTP/2 and Protocol Buffers. HTTP/2 enables efficient, multiplexed communication with features like streaming and header compression, while Protocol Buffers provide a compact, language-neutral way to serialize structured data. Together, these technologies allow gRPC to deliver high-performance, cross-platform communication that is well suited for modern microservices environments.