WebRTC (Web Real-Time Communication) is a technology that supports direct communication (peer-to-peer) between browsers, allowing us to transmit audio, video and data directly between two browsers without going through an intermediary server. This technology is already built into most modern browsers like Chrome, Firefox, Opera and Edge.(According to Tech Target)
WebRTC can also be used to collect user browser information, this is known as WebRTC Fingerprinting. When a website requests access to the user’s camera or microphone, the browser displays a window asking for access. However, through WebRTC, the website may also collect information about the user’s browser, such as screen resolution, CPU speed, browser version, and operating system.