Q: Do you know about WebSocket? What is it?

A: Yes. WebSocket is a communication protocol that provides a persistent, full-duplex connection between a client (like a browser) and a server. Unlike the traditional HTTP request-response model, WebSocket allows for real-time, two-way data exchange over a single, long-lived TCP connection. It is commonly used in web development for applications that require instant updates, such as live chat, gaming, and collaborative editing. The connection starts with a handshake (similar to HTTP) and then upgrades to the WebSocket protocol.