At present there is an excitement about cloud computing and also a state of confusion at the same time. The excitement or confusion about cloud adoption, should one go for cloud or not? What will be the benefits? At the same time what will be the associated risk? Will the benefits be more compared to the associated risk? Up to what extent will it affect the company? There are so many such concerns. Here the author detailing about cloud computing, its purpose/benefits and threats to cloud/cloud vulnerabilities.