Refers to IoT technologies (sensors, connectivity, analytics) applied in industrial contexts. IIoT involves networks of smart devices and sensors in factories, energy grids, etc., that collect and share data for monitoring and optimization. Examples: wireless vibration sensors on motors feeding data to cloud analytics for predictive maintenance; or smart meters and smart grid devices in utilities. The IIoT concept often ties into Industry 4.0 and digital transformation: essentially using internet-connected devices to make industrial operations more intelligent and efficient. (It also expands the attack surface of OT networks, hence the security concern around it.)
