EMQX is a high-performance, open-source MQTT broker designed to handle millions of concurrent connections. Built for IoT applications, it supports advanced features such as clustering, load balancing, and high availability. EMQX offers full compliance with MQTT 3.x and MQTT 5.0 standards, ensuring broad compatibility. It also supports extensions like rule engines, authentication, and integration with databases and cloud platforms. Due to its scalability, EMQX is often used in enterprise IoT deployments and large-scale messaging systems. It is widely recognized as one of the most powerful MQTT brokers available today.