Anytime you stream audio or video over the Web there is a good chance that WebRTC might be under the hood directly or indirectly.
Now, WebRTC is an open-source project, it enables realtime streaming (Audio + Video) over Internet by providing a set of APIs.
That being said there still can be a learning curve while starting out with WebRTC.
If you short on time to deeply understand WebRTC Protocols, or just need a small MVP application you might be tempted to use a library like PeerJS.
PeerJS is built on top of WebRTC and hides a lot of low level details from the user.
However, If you are planning to implement something Big and Complex it would make sense to get WebRTC Concepts clear. It would be worth it.
You can run this application locally,
After Cloning,
npm install
npm run dev
However, it would be a bit difficult to check stuff locally.
You can try out the deployed application for that matter: https://limitless-journey-12267.herokuapp.com/
Note: Microphone permission would be required.
Note2: Please use earphones if you would not like to blast yourself with some high pitched echo :) Earphones would be good!