Operating Systems?????

the OS lets you communicate with the machine(computer). in simple terms, it converts all your commands(or input), from simple typing and movement of the mouse, up to complex graphic animations and sends it to the processor for final processing and output.
when your OS gets corrupted, it is (usually)designed to hang to, at the very least, avoid corrupting your important data stored in your computer.
without the OS, there is no way for users to communicate with the computer.

you can consider operating system as an interface between hardware and user. basically without an operating system a computer is basically useless! though you can do assembly level programmings manually without an operating system. but we have many more things to do without this thing.

OS to computer is like the brain to human.Without it,all the hardware can't work on order.

Operating system come betwean user and hardware of computer. It controls everything related to the hardware. actually it makes it possib;e to communicate with hardware. It controls all I/O systems.
In addition file managment and memory managment and all event managments are done through operating system. When Operating system corropts it looses some part of information required to control the hardware. In this case some where in it's code it cannot keep track of the required information.

With no Operating system working with hardware turns to be mess.

OS or Operating Systemis the bridge between the hardware of you computer.. It manage the hardware and softwares in you computer.. If corrupt,it is like you without eyes, feelings,hearing, etc..