(i) Oreo
(ii) Marshmallow
(iii) Nougat
(iv) Kitkat

Device management is the process of managing the operation, implementation, maintenance of physical and virtual devices.

Storage Management creates various methods, tables and trees to store data efficiently, so the user won't have to mention addresses as to where to store data.

(i) Internet
(ii) Intranet

(i) CUI   (ii) GUI

Operating System was needed to enable the user to design the application without the knowledge of the computer's internal structure and hardware system and also needs an interface to interact with the computer and controls the execution of all kinds of programs without knowing the internals of the hardware.

The function of Operating system includes file management, memory management, process management and device management.

Text editor, Anti virus programs, Compression Tools.

It refers to the software which is made available with a right to redistribute copies.

(i) Software must be available free or at a low cost
(ii) Source code must be included
(iii) Anyone must be allowed to modify the source code.
(iv) Modified versions can be redistributed.

The different types of operating system used in the computer
(i) Single User and Single Task Operating System
(ii) Multi User Operating System
(iii) Multi Processing Operating System
(iv) Distributed Operating System
(v) Prominent Operating System

This is a one of the features of Operating System. It has two or more processors for a single running process (job).

The Operating System provides three levels of securities to the user end. They are
(i) File access level
(ii) System level
(iii) Network level.

The GUI is a window based system with a pointing device to direct I/O, choose from menus, make selections and a keyboard to enter text. Its vibrant colours attract the user very easily.

Multi-user Operating Systems:
(i) It is used in computers and laptops that allow same data and applications to be accessed by multiple users at the same time.
(ii) The users can also communicate, with each other. Windows, Linux and UNIX are examples for multi-user Operating System.