IoT Day is an annual event for the IoT Community to showcase their concern for people, the environment, animals, and machines. Rob van Kranenburg, the founder of IoT Council, talks about the beginnings of IoT and how the IoT Day came to be. He also highlights the development of IoT-Day, which initially focused on technical aspects, but later expanded to verticals and domains. Despite the rise of numerous days that celebrate various topics, IoT Day remains recognized and celebrated by the IoT community, with events ranging from product presentations to conferences, meetups, and discussions.