WebRTC, or Web Real-Time Communication, is a collection of open-source technologies that allow web browsers and mobile applications to support real-time communication, such as voice and video calling, without the need for plug-ins or other external software. WebRTC enables peer-to-peer communication between browsers and mobile applications, allowing users to share audio, video, and data in real-time. It also includes support for NAT (Network Address Translation) traversal and other features that make it easier to establish and maintain connections between devices. WebRTC is supported by most modern web browsers, including Chrome, Firefox, and Safari, and is widely used for applications such as video conferencing, online gaming, and live streaming.