WebSocket is a communication protocol that provides full-duplex communication channels over a single TCP connection. It is used to create interactive and real-time web applications, allowing for the seamless exchange of data between a client and server without the need for constant HTTP requests. The protocol is particularly useful in scenarios like chat applications, live notifications, and multiplayer gaming. This tag covers various aspects of WebSocket, including its implementation, use cases, benefits, and challenges, positioning it as an essential component in modern web development.