Here are some common operating system interview questions along with their answers: What is an Operating System? Answer: An operating system (OS) is a software that manages computer hardware and provides services for computer programs. It acts as an intermediary between the hardware and the user applications. What are the functions of an Operating System? Answer: The functions of an operating system include process management, memory management, file system management, device management, security, and user interface. What is the difference between a process and a thread? Answer: A process is an instance of a program in execution, while a thread is a lightweight process within a process. Threads share the same memory space, while processes have their own memory space. What is virtual memory? Answer: Virtual memory is a memory management technique that provides an illusion to the user of a contiguous memory space larger than the physical memory (RAM) available in the system. It allows