Cloud Services For Dummies, IBM Limited Edition  14 organization, and it may also use a SaaS HR public cloud application. In addition, to support its online commerce  system, the company may leverage public commercial cloud  services to ensure that customer service remains satisfactory  during times of peak use, such as holidays. The same company might also create a private cloud application that it makes available to partners linking to its online sites. This type of hybrid environment will become the standard  way companies run IT in the future. A company will typically  use public cloud services such as SaaS to support customer  relationship management, IaaS to add capacity on demand,  and PaaS to support an experiment development process.  This development makes sense because increasingly companies are looking for a cost-effective, flexible, and optimized environment to support internal operations, customers, partners, and suppliers. When a company selects this route, it takes the responsibility  for the integration, security, manageability, and governance of  the composite environment — including the public services  that are included. In other words, IaaS and PaaS are foundational services that  other cloud services will sit upon. IaaS itself is the foundation  upon which PaaS can be utilized to build value. It supplies the  infrastructure that developers can use to build applications.  For example, many organizations are using IaaS and PaaS linked  together for the development and operations process — which  we will get into later in this book. These organizations may  even be using IaaS and PaaS to build actual SaaS services. So,  in some ways, IaaS services is the base of a pyramid with the  infrastructure at the bottom, the middleware (PaaS) at the  center, and the applications on top. These materials are the copyright of John Wiley & Sons, Inc. and any  dissemination, distribution, or unauthorized use is strictly prohibited.