Native Client is an open-source technology for running native compiled code in the browser, with the goal of maintaining the OS portability and safety that people expect from web apps. Native Client expands web programming beyond JavaScript, enabling developers to enhance their web applications using their preferred language. This document describes a few of the key benefits of Native Client, as well as current limitations, common use cases, and tips for getting started with Native Client. (via Technical Overview - Native Client — Google Developers)