Developing a universal quantum computer that can solve complex problems beyond the reach of classical computers is an open challenge. Achieving this requires integrating a large number of qubits into a quantum processor, much like integrating millions of transistors in a silicon chip. Among the available quantum computing approaches, semiconductor spin qubit technology has a unique advantage in scaling up to larger quantum systems as it builds on well-established semiconductor chip processing technology. This chapter aims to provide a comprehensive overview of semiconductor spin qubit technology for nonspecialists. The chapter begins by explaining the operational principles of spin qubit systems. It then introduces different types of spin qubits and commonly used terminologies, assesses the performance metrics, and compares them with other quantum computing technologies. Active research activities in academia and industry are also discussed. Finally, the chapter reviews recent trends in spin qubit research and offers practical recommendations.