MQTT (Message Queuing Telemetry Transport) is a lightweight messaging protocol designed for low-bandwidth, high-latency, and unreliable networks. It is used to facilitate communication between devices, systems, and services in the Internet of Things (IoT).
MQTT is important for the IoT because it enables devices to communicate with each other in a secure, reliable, and efficient manner. It is also designed to be lightweight, making it ideal for low-power devices like sensors and actuators.
For example, a temperature sensor can use MQTT to send data to a cloud-based service that processes the data and sends it to a mobile app. The app can then use the data to display the temperature readings in real-time.