necessary elements for computer system:

in a computer system each and every thing/ equipment has a vital role. for example hardware and software. these two things are very important for each other. without hardware , a software is nothing. and without software a hardware is nothing. a software is a set of instruction which is given to computer to perform a specific task. a hardware is a physical structure of a computer. we can touch, we can see , and portable. we cannot touch to software, it is only a program, in our daily life, for example, human being is the best example of hardware and software. without soul , our body is just like a dustbin or death body.  and without body , soul is nothing. so both of the things are necessary for human being. similarly in computer system