3. The Kernel
The kernel has the task of:
- Loading / Unloading applications from memory
- Scheduling tasks to run efficiently on the CPU
- Memory management
- File storage to and from secondary storage devices such as the hard disk
- File management
- Data security
The kernel within each different type of operating system is responsible for a slightly different blend of tasks.
For example, a 'single user, single application' operating system does not have to deal with networking, whereas the kernel in a network operating system would be responsible for this.
Because memory is such a limited resource on mobile phones, their operating systems require a more efficient memory management kernel as opposed to those running on PCs.
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