المصدر: Before cloud computing we have to know what is cloud. The term Cloud refers to Internet or a network.In other words, we can tell that Cloud is something which is present at remote location. Cloud can provide services over network, which is on public or on private networks, that is, WAN, LAN or VPN. “Cloud computing” term is used to refer to a model of network computing where a program (application) runs on connected server/servers rather than on a local computing device such as a PC, tablet or Smartphone. For more information on this you : http://www.educba.com/course/introduction-to-cloud-computing/can visit our website