• sandeep kumar sahu
• rahul kumar chawda

An Operating System or OS is the m ost important software and program that can run all types of Computer, Mobile phone, Hand Held Device, etc. It helps to connect and interface comput er hardware to program and application software and other common essential services. The OS is initially loaded on at boot time. Like a host, the OS acts fo r running and handling of application programs and operation of the hardware on the machine. The working principle of OS is first to configure then check abil ity to perform and then allow the program to run. Its m ain purpose is to handle the activities based on computer hardware. The OS also provides management of input, output and storage devices. Mostly in a system, some different computer programs run at the same time and they need to access CPU, memory, and storage. In an operating system, the user can commu nicate with the Command Line Interface by typing some command, and the user receives the response b ack from the system. But Modern Time Operating system uses a graphical user interface or GUI for easy to use. Now user can communicate with a system using a mouse to click button, menus, and everything is displayed on the screen using Text, Graphics or image. It is like a bank manager-- it makes sure that th e working of application software must not be interfered by any other activity.

Introduction, Type of operating system, operating system service, security, function of operating system, Example of some ope rating system

" operating system ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.319-325, April-2019, Available :http://www.jetir.org/papers/JETIR1904J41.pdf

" operating system ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp319-325, April-2019, Available at : http://www.jetir.org/papers/JETIR1904J41.pdf