An operating system (OS) is the software that manages a computer's hardware and software resources. It acts as a bridge between users and the computer, allowing them to interact with the machine. Common examples of operating systems include Windows, macOS, and Linux. The OS handles tasks like running applications, managing files, and controlling peripheral devices such as printers and keyboards. In addition to managing resources, an OS provides a user interface, which can be graphical (like icons and windows) or command-line based. This interface allows users to perform tasks easily, such as opening files, installing software, and customizing settings. Overall, the operating system is essential for the smooth operation of any computer system.