The ability to have real-time two-way communication between the client and the server is a key feature in most modern web apps.

In traditional web applications, it’s only possible to interact with the server via a request and wait for a response. With modern interactive applications, this approach is not ideal for any user interaction when we want to get updates from the server without having to continuously make requests to learn if anything interesting has happened on the server. The solution is to provide a bi-directional, persistent means of communication between the client and the server. This is where WebSocket comes in.