Types of OS

An Operating System, or OS, is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer Operating System, a computer would be useless.
Operating system types :
GUI - Short for Graphical User Interface, a GUI Operating System contains graphics and icons and is commonly navigated by using a computer mouse.Examples of GUI Operating Systems.
Windwos 98,Windows2000,windowsXP,Windows Vista,Ubuntu.
Multi-user - A multi-user Operating System allows for multiple users to use the same computer at the same time and/or different times.Some examples of multi-user Operating Systems.
Linux,Unix,Windows2000,WindowsXP,Windows2003.
Multiprocessing - An Operating System capable of supporting and utilizing more than one computer processor. Below are some examples of multiprocessing Operating Systems.
Examples : Linux,Unix,Windows2000,Windows2003.
Multitasking - An Operating system that is capable of allowing multiple software processes to run at the same time. Below are some examples of multitasking Operating Systems.
Multithreading - Operating systems that allow different parts of a software program to run concurrently. Operating systems that would fall into this category are:
Linux,Unix,Windows2000,Windows2003.