MQTT is a lightweight messaging protocol designed for low-bandwidth, high-latency networks, making it ideal for IoT applications. It enables devices to send messages in real time using a publish-subscribe pattern, which reduces the need for constant polling. MQTT ensures efficient data transmission by minimizing overhead, which is crucial for devices with limited resources such as sensors or mobile devices. It supports message queues, which ensure reliable delivery even in unreliable network conditions. MQTT is widely adopted in smart home systems, automotive telematics, and other IoT domains due to its simplicity and scalability.