a href="#service-version">service versions</a> for a given <a href="#service">service</a> and Envoy chooses the version based on routing rules.</p></dd></dl><h4 id="E">E</h4><dl><dt id="envoy">Envoy</dt><dd role="definition" aria-labelledby="envoy"><p>The high-performance proxy that Istio uses to mediate inbound and outbound traffic for all <a href="#service">services</a> in the <a href="#service-mesh">service mesh</a>. <a href="https://envoyproxy.github.io/envoy/">Learn more about Envoy</a>.</p></dd></dl><