Continuing the discussion from Alternative to Skype and facetime:
What is it?
WebRTC is an open-source web-based application technology, which allows users to send real-time media without the need for installing plugins. Using a suitable browser can enable a user to call another party simply by browsing to the relevant webpage.
Why?
WebRTC has a big advantage over most VoIP services in the security area. Until now, most services have typically treated security as optional, meaning most end users use VoIP calls without encryption. Large corporations in particular are a leading culprit for this, choosing to save money on cheaper implementations rather than properly considering their users or the value of the data that they handle. But as WebRTC forbids unencrypted communication, users can be assured that their data remains safe and private.
Read more on: A Study of WebRTC Security