This name itself talks about the maximum number of devices connected. Focus areas are 

• transmitting a relatively low volume of non-delay-sensitive data
• Devices are required to be low cost
• very long battery life

We can take an example of farming. So we can deploy multiple machines which are connected to each other for checking soil condition, looking for water requirements ,and checking crops growth. and all the activity Can be handled and monitored through one centralized system.