When rapid expansion in less time is the need for a business, a truly scalable system helps to grow the company by rolling out updates as needed, at a time or speed that helps the organization. Microsoft Azure provides scalability for all services, and it is also implemented with the IoT Hub. The need for scalability depends upon the performance characteristics that your IoT solution needs. A single IoT Hub unit can connect with millions of IoT devices. But based on the need, we can define more IoT Hub units and scale the solutions.