It's a standard way for browsers to engage in real time communications - most often used for video calls, but not necessarily limited to them. WebRTC is impleme

It's a standard way for browsers to engage in real time communications - most often used for video calls, but not necessarily limited to them. WebRTC is implemented in all the major browsers, and offers push button peer to peer video calls. Ghangouts and jitsi both use WebRTC. Slack and Hipchat use it. Skype is gradually moving over (from the MS proprietary oRTC), so even Microsoft Teams will use it soon.