Types of operating system

The variations and differences in the nature different operating systems may give the impression that all operating systems are absolutely different from each other. The types of operating systems are:

Single user operating system

             The single user operating system allows one user to work at a time. The resources of the           system namely the CPU time and printing facilities are idle till the user logs off. These                    operating systems are used mainly for computers having only one terminal (stand-alone PCs).  Examples are MS_DOS,PC_DOS.

A Multi-user operating system 
A Multi-user Operating system lets more than one user access the system at one time. Access the computer system is normally provided via network, so that users access the computer remotely using a terminal or other computer. The popular operating systems used for multi-user system are UNIX,LINUX,NETWARE,Ms-Windows,OS/400 etc.