Cloud computing is a technology that allows user to use computation, storage and data access services. Cloud computing is about moving services, computation and data for cost and business advantage. It is a location-transparent, centralized facility. These services are provided on the basis of cast. By making data available in the cloud, it can be more easily accessed often at much lower cost, increasing its value by enabling opportunities for enhanced collaboration, integration, and analysis on a shared common platform. This paper explores the definition, nature and potential of cloud computing and research questions related to cloud computing.