**Operating System:**

An operating system is a software that acts as an intermediary between computer hardware and the user. It manages computer hardware resources and provides services for computer programs.

**Usefulness of Operating System:**

- **Resource Management:**
- An operating system manages computer hardware resources such as CPU, memory, disk space, and peripherals efficiently.
- It allocates these resources to different applications and users as needed, ensuring optimal performance.

- **User Interface:**
- Operating systems provide a user-friendly interface for users to interact with the computer.
- This interface can be graphical, command-line, or a combination of both, making it easier for users to perform tasks.

- **File Management:**
- Operating systems handle file management by organizing and storing files on storage devices.
- They provide mechanisms for creating, deleting, copying, and moving files, as well as for organizing them into folders or directories.

- **Security:**
- Operating systems implement security measures to protect the computer system from unauthorized access and malicious attacks.
- They control user access permissions, encrypt data, and detect and prevent security threats.

- **Multi-tasking:**
- Operating systems support multi-tasking, allowing multiple applications to run simultaneously on the computer.
- They manage the execution of these applications, switching between them to give the illusion of parallel processing.

In conclusion, an operating system plays a crucial role in managing computer resources, providing a user-friendly interface, handling file management, ensuring security, and supporting multi-tasking. It is essential for the proper functioning of a computer system and for enabling users to interact with their devices effectively.

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