What is IOT - Internet of things?

IOT https://en.wikipedia.org/wiki/Internet_of_Things

Enabling technologies for the IOT

There are mainly three types of technologies that enable IOT.^[121]

1. RFID and near-field communication - In the 2000s, RFID was the dominant technology. Later, NFC became dominant (NFC). The latest iPhone 6 supports NFC for Apple Pay.
2. Optical tags and quick response codes - This is used for low cost tagging. Phone cameras decodes QR code using image-processing techniques. In reality QR advertisement campaigns gives less turnout as users need to have another application to read QR codes.
3. Bluetooth low energy - This is one of the latest tech. All newly releasing smartphones have BLE hardware in them. Tags based on BLE can signal their presence at a power budget that enables them to operate for up to one year on a lithium coin cell battery.