The idea of cloud computing was first designed by an intelligent man John McCarthy. It was way back 1960s when this idea was formed. And nowadays cloud computing designs are based on McCarthy's idea. Cloud Computing Services helped me on this subject.
Cloud Computing has been developed over a period of time. The Concepts of time sharing and resource sharing have existed since the days of the Mainframe.
AWS or Amazon Web Services is the pioneer and flag bearer of Cloud Computing today.