WebSockets enable full-duplex communication between clients and servers. In Node.js, you can implement WebSockets using libraries like ws. Example of a simple WebSocket server:
const WebSocket = require('ws');
const server = new WebSocket.Server({ port: 8080 });
server.on('connection', socket => {
socket.on('message', message => {
console.log(`Received: ${message}`);
socket.send(`Echo: ${message}`);
});
socket.send('Welcome to the WebSocket server!');
});