Mohammad Oqail Ahmad, Dr.Rafiqul Zaman Khan
These days, the Cloud Computing is probably the most considerable technology in the IT sector. It is broadly made use to deliver services well over the internet for both low priced and technical motives. Cloud Computing support virtualization technique over the internet to meet the stretchy demand of the users with less interaction by having service provider. For that reason users are progressively engaging toward this trend. In this paper, we presented brief review of Cloud Computing; it also includes comparative study between Cloud Computing, Distributed, Utility, Cluster, and Grid Computing and also three deployment model and service model. This paper also lay out brief discussion of the main characteristics of cloud computing, benefits, challenges and its applications.