An __*operating system*__ (`OS`) provides a range of primary services both for the user and the system. Here are some of the most important services:

1. **User interface:** The OS provides a graphical user interface (GUI) or a command-line interface (CLI) for the user to interact with the system.

2. **Process management:** The OS manages the execution of programs and processes, allocating system resources such as memory, CPU time, and input/output devices.

3. **Memory management:** The OS manages the allocation and deallocation of memory for programs and processes, ensuring that each program has access to the required amount of memory.

4. **Device management:** The OS manages the access to input/output devices such as keyboards, mice, printers, and storage devices.

5. **File management:** The OS provides a file system that manages the storage, retrieval, and organization of files and directories on disk or other storage media.

6. **Security:** The OS provides various security features such as user authentication, access control, encryption to protect system and user data.

7. **Networking:** The OS provides networking services that allow the system to communicate with other computers and devices over a network.

8. **Error handling:** The OS provides error handling services that detect and respond to errors that occur in the system, such as hardware failures, software crashes, or security breaches.

Overall, the primary services an operating system provides for the user and the system are to provide an interface for users to interact with the computer, manage and allocate system resources, and ensure the security and reliability of the system.
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