gRPC leads multi-language backend RPC systems

gRPC is the undisputed standard for high-performance internal microservices communication, but its complexity makes it overkill for simple client-facing APIs. Its support for HTTP/2 enables bi-directional streaming and multiplexing for lower latency, while Protocol Buffers serialize data into a compact binary format that significantly reduces payload sizes compared to JSON. Additionally, automated code generation aligns client-server interfaces across multiple backend programming languages. However, a steep learning curve and lack of browser-native support restrict its utility primarily to backend systems.