Over recent years industries have faced the problem of how to connect devices to "speak" to each other with minimum wiring. Philips Semiconductors faced this problem when they needed to connect many ICs together. The automotive industry faced the same problem when it needed to connect tens of microcontrollers in each car. Recently, with smart homes, the problem has started to be part of each home. For instance, you may want to build your smart home with accessories from different manufacturers and you want the devices to "speak" to each other. Added to that, you may want to control them from a central App or voice assist.