Iot, standing for “Internet of things”, aims to introduce internet connectivity to every device and most parts of life like gardening, sports, music and so on. IoT is not just for professionals, it’s actually quite often done by hobbyists and amateurs that are interested in the craft. There are, of course, advanced IoT networks that require expensive hardware and are aimed for companies or the country. Those kind of networks and things are mostly developed and deployed by professionals.
IoT stands for Internet of Things which incorporates all kind of components like sensors, microchips, controllers and of course, software. All those "things" are connected to the internet and communicate with each other creating a network of IoT devices. IoT can be used everywhere, from farimng to enterprise IT companies. It's really popular among hobbyists and people who like to experiment with new stuff.