The Internet of Things (IoT) is the idea that any object might be connected to the internet. Such objects could be elementary devices such sensors or actuators. Or they might be ‘smart’ versions of everyday devices, e.g. home appliances, electricity meters, or ‘wearables’. The internet connectivity allows all of these objects to interact either with each other or with servers. In some cases it provides improved functionality for the smart object. In other cases, benefits arise through the use of vast numbers of smart devices, feeding data to and from servers and other devices. Some commentators believe the IoT will totally revolutionise our lives, to the extent that it has been described as the 4th Industrial Revolution.