An operating system is a set of software that manages the hardware and software resources of a computer. It is responsible for managing the computer's memory, processes, and all of its software and hardware. To determine the effectiveness of an operating system in business, you can look at how it is used to manage resources, how it is used to keep the computer secure, and how it is used to improve the efficiency of the business. Additionally, you can look at customer reviews and feedback to get an idea of how well the operating system is performing.