Operating System :-


   It is a software which manages computer hardware.It acts as an interface between  computer user and computer hardware.
   Operating systems can be classified as follows

1) Single User - Single task Operating Systems
    Ex: DOS ( Disk Operating System)
2) Single Use - Multiple tasks Operating Systems
    Ex: Windows
3) Multiple Users - Single task Operating Systems
    Ex: Unix / Linux
4) Multiple Users  - Multiple tasks Operating Systems
    Ex: Unix / Linux

Main functions of Operating Systems

1) Process Management
2) Main memory Management
3) File Management
4) I/O Management
5) Secondary storage Management