WebRTC stands for Web Real-Time Communications. It is a very powerful, exciting, leading-edge technology and standard.
Being a free, open-source project, it offers mobile applications and web browsers with real-time communication through simple APIs (Application Programming Interfaces). It allows video and audio communication to work inside web pages by eliminating the need to download native apps or install plugins and allowing direct peer-to-peer communication.
Supported by Opera, Mozilla, Google, Microsoft, and Apple, WebRTC is being standardized through the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C).