MQTT sends small messages between devices with minimal overhead — ideal for IoTInternet of Things — networked sensors and devices embedded in appliances, factories, and cities. sensors, industrial SCADA, and mobile networks. Brokers route topics like `factory/line1/temperature`; clients subscribe and publish with at-most-once or guaranteed delivery. AWSAmazon Web Services — the dominant cloud platform for compute, storage, and managed infrastructure. IoTInternet of Things — networked sensors and devices embedded in appliances, factories, and cities. Core, HiveMQ, and millions of embedded devices use it today.

MQTT solved messaging over expensive, high-latency satellite links for oil-pipeline monitoring.

It became the dominant wire protocol for IoTInternet of Things — networked sensors and devices embedded in appliances, factories, and cities. and constrained devices worldwide.