International Journal of Emerging Technology in Computer Science and Electronics ( IJETCSE)
Internet has changes the computing world providing abundant resources for the user, moving from cluster to grid, grid to cloud. The cloud provides an environment where the requirements like computing power, data storage and memory are provided to the customer as utility computing. There are many deployment models and service models. In this paper, the authors will discuss the service models, the different types of clouds, namely public cloud, private cloud, hybrid cloud, inter-cloud and their architecture and introduction to community cloud, distributed cloud and multi-cloud and challenges and obstacles in the cloud.