hy do we have two modes of execution in operating systems?what are they?

Question

Accepted Answer

Two modes of execution in operating systems are user mode and kernel mode.

User mode is a restricted mode where user applications run.
Kernel mode is a privileged mode where the operating system kernel runs.
User mode has limited access to hardware and system resources.
Kernel mode has full access to hardware and system resources.
Switching between modes requires a system call or interrupt.
Examples of system calls include opening a file or creating a process.
Kernel mode is more powerful but also more dangerous if misused.
User mode is safer but less powerful.
Operating systems use both modes to provide security and stability.
Kernel mode is used for critical tasks like memory management and device drivers.
User mode is used for running user applications like web browsers and word processors.

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