What is the main function of the operating system kernel?

The main function of the operating system kernel is to manage system resources and communication. The kernel acts as a bridge between the hardware of the computer and the software applications that run on it. It is responsible for controlling access to hardware components, such as the CPU, memory, and disk storage, ensuring that applications can efficiently use these resources without interfering with each other.

Additionally, the kernel manages communication between hardware and software by facilitating the execution of processes, handling interrupts, and scheduling tasks. By doing this, the kernel ensures that multiple applications can run concurrently while providing a stable and secure environment.

The other functions mentioned in the options, like providing a graphical user interface, storing files and data, and running applications in isolation, are components or functions that may be managed by other parts of the operating system or applications themselves, rather than directly by the kernel. The graphical user interface is typically a higher-level function built on top of the kernel, while file storage and application isolation are other layers of functionality that rely on the kernel's resource management capabilities.