What Does Web Real-Time Communications Mean?
It is a project conceived and managed by the World Wide Web Consortium (W3C) to enable browser-to-browser communications without the need for additional plug-ins/utilities.
Techopedia Explains Web Real-Time Communications
WebRTC is primarily designed to enable users with multi-platform, or similar browsers, to interact with each other using voice, text and video communications. It eliminates the need for installing any third-party desktop communication software and it requires a Web API within the browser for initiating and managing communications directly with another user.
Developers can use the WebRTC Web API to create applications that comply with the principles of WebRTC. Currently, WebRTC is supported by Google Chrome, Mozilla Firefox and Opera.