The document discusses various use cases for WebRTC including web conferencing, contact centers, IMS, unified communications, and vertical industries. It provides examples of how WebRTC is being used in Google Hangouts for web collaboration, advanced contact centers to improve customer experiences, and by Amazon for their Mayday customer support. The document also reviews how WebRTC can connect to the public switched telephone network through IMS and enable rich communication services on the web for mobile service providers.