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An operating system (OS) is a software that manages computer hardware and software resources and provides common services for computer programs. It acts as an interface between the computer hardware and software, allowing users to interact with the computer and execute programs.

The operating system performs several important tasks, including:

1. Process management: It manages the execution of programs or processes, allocating system resources such as CPU, memory, and input/output devices.

2. Memory management: It controls and manages the computer’s primary memory (RAM), allocating and deallocating memory to different processes and ensuring optimal usage of available memory.

3. File system management: It organizes and manages files and directories, providing methods to store, retrieve, and manipulate data on various storage devices such as hard drives or solid-state drives.

4. Device management: It controls and manages input/output devices, including keyboards, mice, monitors, printers, and network devices, ensuring proper communication and interaction between the computer and these devices.

5. User interface: It provides an interface for users to interact with the computer system, whether through a command-line interface (CLI) or a graphical user interface (GUI), making it easier for users to run programs and perform tasks.

6. Security: It ensures the security and protection of the computer system by controlling access to resources, implementing user authentication and authorization, and providing mechanisms to detect and prevent unauthorized access or malicious activities.

Overall, the operating system plays a crucial role in managing hardware and software resources efficiently, ensuring the stability, security, and usability of a computer system.

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