In a layman language operating system is the software that brings life to computer system. Operating system itself does not do any thing but provides an environment in which other software programs could execute. It provides an interface between the user and the computer hardware. It directs the user to operate on the computer. It provides guidelines to user on how to work on computer. Operating system is the software that makes other hardware work in an efficient manner.
The field of hardware and software has also become the career for new generation and has very wide prospects in this field. People who wanted them to be established as hardware or software engineers can complete their degree or diploma course from any reputed institution and start their career with the established organization or can if they are willing to be entrepreneurs they can start their own company working in this field.