This report provides a comprehensive overview of the business information system of an ATM machine. It discusses the various components such as card reader, keypad, speaker, display screen, and receipt printers. The report also highlights the benefits and drawbacks of the system, including the risks associated with it, such as fraud currency, logical attacks, and physical attacks. Furthermore, an in-depth analysis is provided on the skimming technique used to manipulate ATM transactions. The report concludes by emphasizing the importance of understanding the business information system of an ATM machine for effective management and security.