Just like HTTP, WebSocket is a communication protocol, but it provides full-duplex (bidirectional) communication between the client and the server. Unlike HTTP, the WebSocket connection always remains open for real-time data transfer. So, in WebSocket apps, the server can send data to the client without having the client initiate the request.
Also, unlike the HTTP schema that starts with HTTP or HTTPS for Hypertext Transfer Protocol Secure, the WebSocket protocol schema starts with ws or wss for WebSocket Secure; for example:
ws://example.com:4000
Socket.IO is a JavaScript library that uses the WebSocket protocol and polling as the fallback option for creating real-time web apps. It supports any platform, browser, or device and handles all the degradation for the server and client to get the full-duplex communication in real time. Most browsers support the WebSocket protocol these days anyway, including Google Chrome, Microsoft Edge, Firefox, Safari, and Opera. But...
