Semiconductors are materials with electrical conductivity intermediate between conductors and insulators, and are a general term for electronic components primarily based on silicon. As transistors and integrated circuits (ICs), they function as the brains of all electronic devices, including PCs, smartphones, automobiles, industrial machinery, and IoT devices. In manufacturing, they are a core technology supporting the foundation of DX promotion, such as FA (Factory Automation), industrial robots, AI, and data analysis. There are diverse service areas including design (EDA), manufacturing (foundry, IDM), material supply, manufacturing equipment, testing, and packaging, with miniaturization, high integration, and low power consumption constantly being pursued. Furthermore, power devices and high-frequency devices made from compound semiconductors like GaN and SiC are also gaining importance, making them an indispensable category supporting the infrastructure of modern society.