“An Operating system is a program that controls the execution of application programs and acts as an interface between the user of a computer and the computer hardware.”
A more common definition is that the operating system is the one program running at all times on the computer (usually called the kernel), with all else being applications programs.
An Operating system is concerned with the allocation of resources and services, such as memory, processors, devices and information. The Operating System correspondingly includes programs to manage these resources, such as a traffic controller, a scheduler, memory management module, I/O programs, and a file system.
Types Of Operating Systems:
Operating systems are there from the very first computer generation. Operating systems keep evolving over the period of time.
Following are few of the important types of operating system which are most commonly used.
1) Batch Operating System
2) Time Sharing Operating System
3) Distributed Operating System
4) Network Operating System
5) Real time Operating System