What is the difference between a preemptive operating system and a non-preemptive operating system?

 A preemptive operating system and a non-preemptive operating system are two different types of operating systems that handle the allocation of system resources differently.

A preemptive operating system is one that can interrupt a running process in order to allocate the processor to another process that has a higher priority. This means that the operating system can stop a lower-priority process and allocate the CPU to a higher-priority process as soon as the higher-priority process becomes ready to run. In other words, the operating system can "preempt" a running process in order to give priority to another process. Preemptive operating systems are typically used in time-sharing systems, where many users share a single system resource, such as a CPU.

A non-preemptive operating system, on the other hand, is one that cannot interrupt a running process. Once a process is allocated the CPU, it will continue to run until it completes its task or it yields control of the CPU. Non-preemptive operating systems are typically used in embedded systems, real-time systems, or systems that do not require multitasking.

The key difference between the two types of operating systems is the ability to interrupt a running process. In preemptive operating systems, the operating system can interrupt a running process to allocate the CPU to another process, while in non-preemptive operating systems, the running process will continue to run until it completes its task or yields control of the CPU. This difference can have a significant impact on system performance, responsiveness, and resource utilization, depending on the specific needs of the system.