WebSocket is a communication protocol that enables a persistent, two-way connection between a user's web browser and a server. Unlike traditional web requests, which require repeated connections for each exchange, WebSocket keeps the connection open, allowing data to be sent and received instantly in both directions. This makes it ideal for real-time applications such as chat, online gaming, and live updates, where immediate communication is essential. WebSocket also reduces the overhead of repeatedly opening and closing connections, improving efficiency and user experience.