现在关于云计算的定义也是很多的，简单列举如下：
[1]1. R Buyya, C. S. Yeo and Venugopal, “Market oriented cloud computing: Vision, hype, and reality for delivering IT services as computing utilities”. Proceeding of the 10th IEEE International Conference on the High Performance Computing and Communications, 2008. A Cloud is a type of parallel and distributed system consisting of a collection of inter-connected and virtualized computers that are dynamically provisioned and presented as one or more unified computing resources based on Service Level Agreements (SLA) established through negotiation between the service providers and consumers [1].
[2]These Cloud providers are also known as Infrastructure as a Service (IaaS) providers and charge users in a pay-as-you-go fashion.
[3]Cloud computing has received significant attention recently as it is a new computing infrastructure to enable rapid delivery of computing resources as a utility in a dynamic, scalable, and virtualized manner [1] 文章名：Real-Time Service-Oriented Cloud Computing 作者： Wei-Tek Tsai [4]Cloud is a type of parallel and distributed system consisting of a collection of interconnected and virtual computers. 文章名：Cloud Computing Initiative using Modified Ant colony framework 作者soumya banerje world academy of science ,engineering and technology 56 2009
[5]The cloud in cloud computing provides the means through which everything — from computing power to computing infrastructure, applications, business processes to personal collaboration — can be deliv- ered to you as a service wherever and whenever you need. 来自于云计算傻瓜书
