what are the main purposes of operating system ??

Answer 1

they tell your computer how to work. without an operating system your computer is just a paper weight.

Answer 2

The main purposes would best be described as a means to interface with the machine. Codes, sometimes called machine language, are complicated and instruct the computer on what calculations to make, switch ports, all sort of computer related functions. The OS makes it easier to navigate the information stored, use apps and all the uses of the computer but in a simple enough way for a non technician or computer programmer to understand. Advances in simplifying operating systems went from DOS to Windows in the early nineties, jumping up the consumer useability and beginning the big trend towards putting a computer in every home, or near abouts. I guess it's easiest answered by saying its purpose to bridge machine language and user interface

Answer 3

dude. Is this your homework? whatever man, The operating system controls and monitors the hard ware operations as a translator for software. When you push SAVE on a program such as word, the document is saved to the hard drive. Well, the program doesn't understand the structure of memory addresses fragmented across many sectors being organized by the File Allocation Table, and compiled into a pointer object known as an icon in the directory of saved data. So the program Word, simply asks the operating system to "save this for me dude!"