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An operating system is a software that manages computer hardware and software resources and provides common services for computer programs. It is the interface between the user and the computer hardware, allowing users to run applications and perform tasks on their computers.Some key functions of an operating system include:1. Process management: The operating system manages the execution of programs by scheduling tasks, allocating system resources, and ensuring proper coordination between processes.2. Memory management: It is responsible for allocating and deallocating memory to processes and managing virtual memory, allowing programs to run efficiently without conflicting with each other.3. File system management: The operating system provides a way to organize and store files on storage devices, allowing users to access and manipulate files through a file hierarchy.4. Device management: It controls the interaction between the computer's hardware devices (such as printers, scanners, and network cards) and the software applications that use them.5. User interface: The operating system provides a graphical or command-line interface through which users can interact with the computer system, run programs, and perform tasks.6. Security management: The operating system implements security measures to protect the computer system and data from unauthorized access, viruses, and other threats.Overall, an operating system plays a crucial role in providing a stable and efficient environment for users to interact with their computers and run various software applications.