index.html

---
layout: landing
title: grpc.io
---


<div class="row landing-context">
  <div class="col-sm-4">
    <h3>Powerful IDL</h3>
    <p>
      Define your service using Protocol Buffers, a powerful binary serialization toolset and language.
<pre>
message HelloRequest {
  string greeting = 1;
}

message HelloResponse {
  string reply = 1;
}

service HelloService {
  rpc SayHello(HelloRequest) returns
  (HelloResponse);
}
</pre>
    </p>
  </div>
  <div class="col-sm-4">
    <h3>Libraries in ten languages</h3>
    <p>Automatically generate idiomatic client and server stubs for your service in a variety of languages.</p>
    <p>
      gRPC has libraries in: <br><span class="lang-list">{% include lang-list.html %}</span>
    </p>
    <h3>Get started</h3>
    <p>
      <a href="/docs/">Overview Guide</a><br>
      <a href="/docs/reference/">API Reference Docs</a>
    </p>
  </div>
  <div class="col-sm-4">
    <h3>HTTP/2</h3>
    <p>
      Building on the <a href="https://http2.github.io/">HTTP/2 standard</a> brings many capabilities such as bidirectional streaming, flow control, header compression, multiplexing requests over a single TCP connection and more.
    </p>
    <p>
      These features save battery life and data usage on mobile devices while speeding up services and web applications running in the cloud.
    </p>
    <h3>Why gRPC?</h3>
    <p>
      Read the <a href="/posts/principles">Design Motivations &amp; Principles</a> behind gRPC.
    </p>
  </div>
</div>