title: What is SaaS, PaaS and IaaS? With examples
body: <p>What do the following terms mean? </p>
  
  <ul>
  <li>SaaS</li>
  <li>PaaS</li>
  <li>IaaS?</li>
  </ul>
  
  <p>There are various cloud services available today, such as Amazon's EC2 and AWS, Apache Hadoop, Microsoft Azure and many others. Which category does each belong to and why?</p>