A WebSocket server is designed for applications that require low-latency, bidirectional communications, such as messaging apps and social media networks. To create such a server, one can use the `websockets` library in Python, which provides a comprehensive framework for managing WebSocket connections. The server establishes a communication channel with connected clients, allowing both parties to exchange messages in real-time. This enables features like live updates and instant messaging without relying on polling mechanisms. With the `websockets` library, developers can create efficient and scalable WebSocket servers that support multiple concurrent connections, making them ideal for applications requiring high-performance bidirectional communication.