Different States of Bluetooth Low Energy

There are four active States of BLE.

At any given point of time, only one state can be active which is highlighted in figure above.

What is Internet of Things ?

The Internet of Things (IoT) is the interconnection of uniquely identifiable embedded computing devices within the existing Internet infrastructure.

Ok, Now explain that!

The architecture of the original Internet was created long before communicating with
billions of very simple devices such as sensors and appliances was ever envisioned.
The coming explosion of these much simpler devices creates tremendous challenges
for the current networking paradigm in terms of the number of devices, unprecedented
demands for low-cost connectivity, and impossibility of managing far-flung and diverse
equipment. Although these challenges are becoming evident now, they will pose a
greater, more severe problem as this revolution accelerates. 

More and more devices are being embedded with sensors and have the ability to communicate. This enables a network of devices that can identify themselves, collect data and also communicate with each other. The 'Internet of Things' is the next radical transformation in the communication era where gadgets talk to each other without any need of human intervention.

Think of a microwave sending an alert to mobile phone or a wearable band once the food is cooked. 

In Healthcare, devices like thermometers, heart rate monitors can take reading and automatically send data to a smart phone or even to a server. The smart phone or server can do some analysis on respective historical data and alerts the user if any parameters are beyond prescribed limits.

A wide variety of end devices will be connected to the Internet of Things

More to come...