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WebRTC security plays a critical role in enabling real-time communication across modern digital systems. Whether it is a doctor consulting a patient remotely, a financial advisor discussing investments, or an enterprise team collaborating across geographies, users now expect communication to be instant, seamless, reliable, and secure. WebRTC has emerged as the technology that makes this possible by enabling real-time audio, video, and data exchange directly within browsers and applications while enforcing built-in encryption and secure transmission by default. However, as WebRTC adoption continues to scale across industries, WebRTC security has evolved from a technical concern into a strategic requirement. Sensitive applications are no longer evaluated solely on performance or features; they are judged on how well they protect user data, ensure confidentiality, and comply with regulations. Any weakness in WebRTC security can quickly erode trust and expose organizations to legal and financial risks. This guide explores WebRTC security in a comprehensive and practical way. Rather than treating security as an abstract concept, it focuses on how developers can actively design, implement, and maintain secure real-time communication systems for sensitive environments. From understanding WebRTC security architecture to applying real-world best practices and leveraging Custom WebRTC solutions, this article aims to serve as a long-term reference for developers and decision-makers alike. WebRTC (Web Real-Time Communication) is an open-source framework that allows applications to support peer-to-peer communication without the need for plugins or external software. It enables real-time audio calls, video conferencing, screen sharing, and data transfer using standard web technologies.What makes WebRTC particularly attractive is its accessibility. It works across browsers, mobile devices, and platforms, significantly lowering the barrier to building real-time communication features. But this ease of access also increases responsibility. When WebRTC is used in sensitive applications, security cannot be assumed, it must be intentionally implemented.