The Internet of Things (IOT) refers to everyday items (not just PCs, phones, tablets, etc) which are connected to & controlled through a network - typically an Internet connection.
What sort of things? Webcams, fridges, home thermostats, lightbulbs, washing machines, cars, door locks, toasters, etc...
In some cases, it's easy to see why this is useful. For example: checking on building security - remotely, via a Webcam. In other cases I'm not sure what the actual benefit could be. Why would you want one of these: Washing Machine, Fridge, Lightbulb?
Now technology is generally great & can be fun, helpful, a productivity boon, or a real time-saver if used appropriately.
However, sometimes I wonder if manufacturers actually stop, take a step back, & say, "are we actually improving product X here, or just building in extra cost, obsolescence, & security vulnerabilities?".
Here are some examples of how not to do the IoT: