An Operating System (OS) is essential software that manages computer hardware and software resources. It acts as an intermediary between users and the computer hardware, enabling users to execute programs and perform tasks efficiently. Common examples of operating systems include Windows, macOS, and Linux. The OS is responsible for various functions, such as managing files, controlling peripheral devices, and overseeing system security. It provides a user interface, which can be graphical or command-line, allowing users to interact with the system easily. Overall, the operating system is crucial for the smooth operation of computers and other devices.