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MQTT is a lightweight, publish-subscribe network protocol designed for constrained devices and low-bandwidth, high-latency, or unreliable networks. It is widely used in IoT applications due to its ability to provide real-time event-driven communication between devices. This article explains the basics of MQTT and outlines the practical steps involved in using MQTT in the cloud. It also covers topics such as hierarchical namespaces, wildcards, and Quality of Service (QoS) levels.