What is WebRTC, and why do you want to use it? While at NDC London, Carl and Richard talk to Liz Moy about WebRTC, the open-source library that is used by many of your favorite video chat applications. Liz talks about taking advantage of the hard work already done to control video and audio devices through the browser, as well as the various strategies for actually connecting to other people through firewalls and NAT routers. The conversation also explores where and when you would want to have integrated video, audio, screensharing, and data transfer capabilities.