The advent of the Industrial Internet of Things (IIoT) has revolutionized traditional industrial sectors by leveraging modern Internet and communication technologies to optimize processes, enhance productivity, and enable intelligent decision-making. This chapter provides a comprehensive introduction to IIoT and explores its significance, key components, and integration with smart computing techniques. It discusses the evolution of IIoT, its role in bridging industrial silos, and the transformative potential it holds across various industries. Furthermore, the chapter introduces smart computing techniques and their pivotal role in extracting actionable insights, facilitating adaptive decision-making, and optimizing industrial processes. Through an examination of key concepts and methodologies, this chapter sets the foundation for understanding the intersection of IIoT and smart computing, paving the way for deeper exploration in subsequent chapters of this book volume.