types of operating systems for computers?

As the computers have progressed & developed, so have the operating systems. Underneath is basic list of the different OS & some examples of operating systems which come down into each of categories. Many computer OS will fall into more than one of below categories:

GUI: Graphical User Interface, the GUI Operating System contains graphics & icons, is usually navigated by using computer mouse. Check the GUI definition for complete definition. Following are some examples of GUI Operating Systems.

System 7.x
Windows 98
Windows CE

Multi user: Multi user OS allows for multiple users to use same computer at the same time & different times. Below are few examples of multi user OS.

Linux
Unix
Windows 2000

Multiprocessing: Operating system capable of supporting & utilizing more than one computer processor. Below are few examples of multiprocessing OS.

Linux
Unix
Windows 2000

Multitasking: Operating system which is capable of allowing multiple software processes to run at same time. Following are examples of multitasking OS.

Unix
Windows 2000

Multithreading: Operating systems which allow different functions of a software program to run. OS which would fall into this category are:

Linux
Unix
Windows 2000