In this paper, the authors describe, how cloud services are offered using cloud computing as well as the different types of computing clouds and their specifics. With the advent of cloud computing the scenario of using and accessing of resources i.e. servers, application and storage is changed significantly. Open source is one of the core foundations of cloud computing. Early pioneer of the cloud utilized the freely available, freely distributable model of open source to power their vision and deployments-achieving a level of scale at a bare-bones cost that had never been seen in the history of computing. In this paper, they discuss cloud basic than they move towards the offerings provided by various service models.