International Journal of Computer Applications
Cloud computing has emerged as a technology that has surrounded the user. The technology has become backbone within few years. Earlier technology which was used in networking was distributed computing. The cloud computing has change whole situation at present. With cloud computing virtual network, the capability of handling million of users becomes easy. The main characteristics cloud possesses are scalability, location independence and virtualization. These characteristics have attracted many IT giants like Amazon, Microsoft, Google, Intel, VMware etc. Amazon is now providing two services first Amazon S3 (Simple Storage Service) and Amazon EC2 (Elastic Cloud Computing).