1. Cloud ComputingCloud computing is becoming one of the watchwords of the IT industry. The cloud is a metaphor for the Internet or a communication infrastructure between architectural components, based on an abstraction that hides the complexity of the infrastructure. Each part of this infrastructure is provided as a service and is normally allocated in data centers, using shared computing and storage hardware (Buyya et al. 2009b). To use the service, users only need to have their machine's operating system, browser, and Internet access. All computing resources are available on the Internet. Therefore, the user's machine does not need to have high computing resources, which reduces the cost of acquiring the machine. Any hardware can be used to perform a task suited to its processing power. New hardware features can be added to increase processing power and work with existing resources. The cloud computing model was developed with the aim of providing accessible and affordable services, to ensure characteristics such as availability and scalability. This model aims to essentially offer three advantages. The first advantage is to reduce the acquisition cost and the composition of the entire infrastructure necessary to meet the needs of businesses, this infrastructure can be composed on demand with varied and less expensive resources. The second is the flexibility this model offers when it comes to adding and swapping computing resources, allowing both hardware and software resources to be increased to meet business and user needs. The final benefit is to provide abstraction and ease of access to users of these services. In this sense, users of the service do not need...... middle of paper...... darts and technology. http://csrc.nist.gov/groups/SNS/cloud-computing.- Vaquero LM, Rodero-Merino L., Caceres J. and Lindner M. (2009). A break in the clouds: towards a definition of the cloud. ACM SIGCOMM Computer Communication Review Volume 39, Number 1, January 2009. http://www.systems.ethz.ch/education/past-courses/fs09/NIS/reading/cloud-definition.pdf- Vecchiola C., Chu ., and Buyya R. (2009). Aneka: a software platform for cloud computing based on .NET. http://www.cloudbus.org/reports/AnekaCloudPlatform2009.pdf - CSA 2009, Cloud Security Alliance Guidance Version 2.1, 2009, http://www.cloudsecurityalliance.org/ - Salesforce (2010). Sales force. http://www.salesforce.com/.-Robinson D. (2008). Amazon Web Services Simplified: Learn how Amazon EC2, S3, SimpleDB, and SQS Web Services help you achieve your business goals faster. Emereo Pty Ltd, London, United Kingdom.