Different kinds of Operating System

The most commonly used operating systems are:
MS-DOS ( Microsoft Operating System )
MS-WINDOWS Microsoft Windows ) (95, 98,2000, xp etc.)
UNIX and LINUX
WINDOWS NT ( New Technology ).
NOS ( Network Operating System ).
SUN SOLARIES
ZINIX / MINIX
OS/2
NET WARE
Mac. OS ( Macintosh Operating System ).
CLASSIFICATION OF OPERATING SYSTEM:
The operating system can be classified as:

1. Single-user operating system,
2. Multi-user operating system,
3. Single-tasking operating system,
4. Multi-tasking operating system,

Single-user Operating System:
Single-user operating system means only one user may log into the system at a time. These operating systems are used on individual computers. this kind of computer system is used only on personal computers. Some of the most widely used single-user operating system.

• MS-DOS
• OS/2
• Macintosh system etc.
• Windows 95 & 98

Multi-user Operating System:
Multi-user operating system means more than one can log into the computer at a time. These operating system are usually used on computers, which are lying over LAN in an office or company. Multi-user Operating System are used on large computers systems for commercial scientific and engineering data processing purposes.
Some of the multi-user operating systems are:

• UNIX / XENIX
• Novell
• Windows NT

Single-tasking Operating System:
The opertaing system on which just a single task can be performed at a time is called single tasking operating system. These operating system are no longer popular now, For example,

• MS-DOS

Multi-tasking Operating System:
The operating system which multi tasks (operation) can be performed at a time is called multi tasking operating system. These operating system have become extremely popular
due to high accessibility options. For example

• UNIX
• WINDOWS
  OS / 2 etc

GUI Operating System:
GUI stands for Graphical User Interface. Windows is a GUI operating system because it provides a visual environment with Command Buttons, Icons, Menus and different color combination. Windows is easy to learn because its graphical interface is consistent from one application to another. People previous using DOS they now prefer to use latest version of UNIX and Windows, Which are GUI operating systems. However Gui systems usually have the disadvantage of requiring more hardware such as CPU, more memory ( RAM ), higher quality monitors etc.