This is simply a front-end of chat window to give an idea of concept. How shall we
communicate in real time?
Backend shall be developed using NodeJS and Socket.io.
What is socket.io?
Socket.IO enables real-time, bidirectional and event-based communication.
It works on every platform, browser or device, focusing equally on reliability and speed.
That sounds cool! Where shall I find it's documantation?
Follow up their official site for more information.
LINK!