You can find the official description on the Microsoft Website. Speaking in IT terms it is basically a message broker (like a MQTT broker) with benefits.
When connecting with the United Manufacturing Hub we will substitute the VerneMQ broker (see also architecture) in the United Manufacturing Hub with Azure IoT Hub.
We recommend to skip this step if you are new to IT / Public-Key-Infrastructure and just want to see some data in Azure. We strongly advise to not use in production.
There are two options / tutorials to get started:
MQTT client id.
Follow the official guide. You can use the free plan for the beginning, which will be sufficient to test everything.
When using asymmetric encryption: when creating a new device select X.509 as authentication type.
We recommend you to connect the United Manufacturing Hub with Azure IoT Hub as a next step.