This book, authored by three experts with the assistance of GPT, provides comprehensive insights into the applications of generative AI, such as GPT, in the financial sector of businesses. It offers background information, benefits, as well as the challenges and risks associated with implementation. In addition to general applications within companies, specific use cases are also presented, focusing on areas such as controlling, business intelligence, accounting, investor relations, internal audit and control systems, risk management, auditing, and data privacy. The book concludes with a discussion on strategies for utilizing GPT effectively.