The Internet of Things (IoT) is simply connecting physical devices/systems to each other via the Internet. Connecting devices, connections and data transfer via the Internet for business/industrial systems, is what’s referred to as the Industrial Internet of Things (IIoT).
When one of the “things” is a current/updated/simulation-based digital model, that’s where the IIoT plays a role in Digital Twins. Learn more about the Industrial Internet of Things HERE.
