Cloud computing: Definition, characteristics, services and models

Abstract

In the past ten years numerous research experts and cloud computing providers have described and defined cloud computing in own specific way. In this paper we indicate some challenges and warnings regarding cloud computing. Furthermore, we list some important cloud computing definitions and describe its characteristics, service models and deployment models based on the NIST's description as a most comprehensive definition today. In addition a brief analysis of the world's leading CSPs and their service models is given.