text: **2.1 A new computing paradigm in cloud transformation**
  
  Cloud computing transformed the way that IT is managed. 
  
  In the traditional method of using services or resources, the owner of the infrastructure is 
  responsible for managing every piece of hardware and software they use. Normally, it takes 
  some time for a user to access a new resource, but it can be configured exactly as needed. 
  
  Traditional infrastructure is often related to aging core applications (typically integrated with 
  aging infrastructure and technologies) that cannot be easily migrated to cloud paradigms. 
  Elasticity, standardization, and other clear cloud advantages are not sufficient reasons to 
  migrate. In other cases, rigid security and country regulations sometimes force users to locate 
  data nearby and under total management control. 
  
  **2.1.1 Cloud service model**
  
  This section describes the different cloud service models. 
  
  **Infrastructure as a service (IaaS)**
  The management responsibility for the company starts with the operating system layer and 
  the provider ensures the availability and reliability of the infrastructure provided. 
  
  Several use cases can benefit from this pattern. Companies that lack an owned data center 
  look to IaaS as a quick, cheap infrastructure for their business initiatives that can be 
  expanded or ended as needed. Traditional companies that need compute power to run 
  variable workloads with less capital expenditure are perfect examples of IaaS adoption. In 
  both cases, companies pay only for the services that they use. 