Initially operating system can be divided into four main parts first of all ....

1: kernel
2: device driver
3: system utilities
4: user interface

KERNEL:
First of all I would discuss about kernel actually it is a core part of operating system . it is responsible for controlling hardware memory and process management and inter process communication it contain the critical functions it is loaded into the main memory during the booting process of computer and performs it functions president in the main memory that's why this part is also called resident part of operating system kernel will be discussed in the next topic...

DEVICE DRIVERS:
Every separate part of hardware that is connected to computer will need a set of programs that allows the operating system to control and communicate with it district of program is collectively called device driver and is provided by the manufacturer of the hardware does the manufacturers of printers, scanners and digital cameras etc.....

Normally provide device driver for each version of computer system if we remove an Operating System such as Windows from hard disk and install Linux instead we shall need to make sure that all correct device drivers for the current operating system has been installed.

SYSTEM UTILITIES:
This part of operating system provides all the basic facilities which normally run in the background to optimize and facilitate the computer operations and its applications for example anti-virus programs file achieving utilities backup program and data compression utility helps to maintain and Secure our working on a computer system...

USER INTERFACE:
This part of operating system manage the interface that we see on the monitor screen the user interface could be a basic command line interface like the OS from path or it might be a graphical user interface (GUI) such as the Mac OS Windows and Linux.