An operating system (OS) is a crucial 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. These systems help run applications, manage files, and control peripheral devices like printers and keyboards. The OS also ensures that multiple programs can run simultaneously without interfering with each other. It handles tasks such as memory management, process scheduling, and security. By providing a user-friendly interface, the operating system makes it easier for people to use computers effectively.