The internet of things (IoT), broadly defined, comprises devices and sensors that connect to a service or network through the internet. 

 IoT is built into everyday consumer and business devices like wearables, security cameras, and temperature sensors. One look on eBay will reveal billions of devices from legitimate companies like Google or Apple and a lot of stealth brands that tend not to attract much attention.

IoT is a big deal in terms of its economic impact. In 2018, analyst firm Gartner predicted that there would be 25 billion ‘connected things’ by 2021. Of course, nobody knows if IDC was right, but what we do know is that IoT is big business.