Cloud computing refers to providing computing and communications-related services with the aid of remotely located, network-based resources without a user of such resources having to own these resources. The network in question typically, though not necessarily, is the Internet. The resources provisioned encompass a range of services including data, software, storage, security and so on. For example, when the authors use a mail service such as Gmail, watch a movie on YouTube, shop at Amazon.com, or store files using drop box, they are using cloud-based resources (The Google Chrome Team, 2010).