What is Microsoft Azure?
Azure is a comprehensive set of cloud services that developers and IT professionals use to build, deploy, and manage applications through our global network of datacenters. Integrated tools, DevOps, and a marketplace support you in efficiently building anything from simple mobile apps to internet-scale solutions.
What is Azure IoT Hub?
Devices/sensors connected to Azure IoT Hub send data to the hub at regular intervals. This listener allows you to read that data for selected devices which can then be used for analysis and/or take necessary actions.