WINDOWS

Windows is a graphical user interface (GUI). 
It is a Multi Task Operating System.

Ms-Dos (Microsoft Disk Operating System) is a Single Task Operating System.
It is a Console User Interface (CUI).
Now a days every one is using this type of OS(Windows) ,because we can perform more than one task at a time.

The figure below shows the fallowing parts:

i)  Desktop

ii) Icons

iii)Task bar

iv) Mouse Pointer

v)  Start Button

vi) Time Indicator

1) Desktop:-

The desktop is the main screen area that you see after you turn on your computer and log on to Windows. 
The Total area displayed on the screen is called desktop.
It having Icons at left side and task bar at bottom there is a possibility to change the desktop properties like desktop background, appearance, screen saver etc.

2) Icons:-

By default is positioned at the left side of the desktop.
Icons are small pictures that represent files, folders, programs, and other items.
It is a small graphical picture every icon having a program.
If you want to open the icon give double click on left button. 
There is a possibility to change the icon place and Name also.

3)  Task bar:-

By default it is positioned at the bottom side of the desk top. 
It shows the present displayed file status.
It shows you which programs are running and allows you to switch between them.
There is a possibility to change the Task bar size and Place also.

4) Mouse Pointer:-

It allows us to open the specified icon or a application . 
Every icon or every program opens through the mouse pointer also.

5) Start Button:-

It is used for to operate the programs of a any applications.
Every Application and Program Opens through the Start button. 
By default it it is positioned at the left side of the task bar.

6) Time Indicator:-

It shows the system time and date. 

It placed on the task bar right side.
There is a possibility to change the system date and Time.