CSK Corp. operates in four segments, providing a range of IT and financial services in Japan. These services include IT services, prepaid card services, securities services, and other related services. The company is known for its expertise in information technology and its ability to cater to the financial needs of its customers. With a strong presence in the Japanese market, CSK Corp. is a key player in the IT and financial services industry, offering innovative solutions and contributing to the growth of the sector in the country.