Description: Job control is a fundamental feature in many operating systems that allows users to manage and monitor the execution of processes and tasks. This functionality is divided into two main modes: kernel mode and user mode. In kernel mode, the operating system has full access to hardware resources and can execute critical operations that require elevated privileges. This includes memory management, process scheduling, and inter-process communication. On the other hand, user mode is where user applications and programs run, limiting their access to system resources to prevent a malicious or faulty program from affecting the stability of the operating system. Job control allows users to start, stop, and prioritize tasks, as well as monitor their status and performance. This separation between kernel and user modes is essential for system security and stability, as it ensures that critical operations are performed in a controlled manner and that users cannot directly interfere with the functioning of the operating system.
