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An operating system (OS) is a software program that manages computer hardware and software resources and provides common services for computer programs. It acts as an intermediary between computer hardware and software applications, allowing programs to run and interact with hardware resources such as memory, storage, and processors.
The main functions of an operating system include:
1. Process management: It manages and allocates system resources to different programs or processes, ensuring that they run efficiently and without interfering with each other.
2. Memory management: It allocates and deallocates memory for processes, ensuring efficient use of available resources and preventing memory errors or conflicts.
3. File system management: It manages the organization, storage, and retrieval of files on storage devices, providing a structured way to manage data and access files.
4. Device management: It manages communication between software and hardware devices, allowing programs to use peripherals such as printers, scanners, and network devices.
5. User interface: It provides a way for users to interact with the computer system, typically through a graphical user interface (GUI) or a command-line interface (CLI).
6. Security: It ensures the security of the computer system by implementing access controls, user authentication, and encryption measures to protect against unauthorized access or data breaches.
7. Error handling and recovery: It detects and handles errors that occur during the operation of the system or applications, recovering from errors and ensuring system stability.
Some popular operating systems include Windows, macOS, Linux, Android, and iOS. Each operating system has its own unique features, design principles, and target audiences, but they all serve the purpose of managing computer resources and enabling the execution of software programs.
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