real time operating system-used to control machinery, scientific instruments and industrial systems.
Single-user, single task- is designed to manage the computer so that one user can effectively do one thing at a time.
Single-user, multi-tasking-This is the type of operating system most people use on their desktop and laptop computers today. Microsoft’s Windows and Apple’s MacOS platforms are both examples of operating systems that will let a single user have several programs in operation at the same time.
Multi-user-A multi-user operating system allows many different users to take advantage of the computer’s resources simultaneously.
Distributed- A distributed operating system manages a group of independent computers and makes them appear to be a single computer. The development of networked computers that could be linked and communicate with each other gave rise to distributed computing. Distributed computations are carried out on more than one machine. When computers in a group work in cooperation, they make a distributed system