Cloud Services For Dummies, IBM Limited Edition  6 continuum of cloud services. These services range from an  open and shared public environment to private cloud that’s  tightly managed with the highest level of security and service. You also discover two key foundational cloud delivery  models: IaaS and PaaS. In addition, Software as a Service  (SaaS) provides packaged business process offerings that live  in the cloud and leverage both IaaS and PaaS services. Cloud computing  is a method of providing a set of shared computing resources that includes applications, computing,  storage, networking, development, and deployment platforms  as well as business processes. Cloud computing turns traditional  siloed computing assets into shared pools of resources that  are based on an underlying Internet foundation. Clouds come in different versions, depending on your needs.  There are two primary deployment models of cloud: public  and private. Most organizations use a combination of private  computing resources (data centers and private clouds) and  public services as a hybrid environment. These clouds are  covered in more detail throughout this chapter. The cloud doesn’t exist in isolation to other corporate IT  investments. The reality is that most companies use a combination of public and private cloud services in conjunction with their data center. Companies use different methods,  depending on their business requirements to link and integrate these services. The way you construct your hybrid  computing environment is determined by the complexity of  the workloads and how you want to optimize the performance  of those workloads to support your constituents. Understanding the foundations of cloud computing calls for  understanding three main cloud delivery models: These materials are the copyright of John Wiley & Sons, Inc. and any  dissemination, distribution, or unauthorized use is strictly prohibited. Foundational Cloud Delivery Services Discovering Cloud Basics