The Industrial Internet of Things (IIoT) is becoming a core driving force for digital transformation in manufacturing. By connecting equipment, systems, and personnel, IIoT enables companies to monitor production processes in real-time, optimize resource allocation, and improve decision-making efficiency. This article provides a detailed introduction to IIoT architecture, key technologies, and implementation strategies. We share success stories demonstrating how IIoT helps companies achieve intelligent production and enhance overall operational efficiency.