a, RabbitMQ, ActiveMQ</td>
                                            </tr>
                                            <tr>
                                                <td><strong>API Gateway</strong></td>
                                                <td>Single entry point, manages authentication and routing.</td>
                                                <td>Can become a bottleneck, adds latency.</td>
                                                <td>Kong, Apigee, AWS API Gateway</td>
    