This is a sidebar to our Article “Exploring Cloud Computing“.
Here is a list of the five most common types of cloud computing.
Software as a Service (SaaS) – a single application, library of applications, an API of web services, infrasructure or development platform users who are not necessarily aware of one another interact with through their browsers; Salesforce.com, Google Apps and Zoho Apps are a few examples. Platform as a Service (PaaS) and Infrastructure as a Service (IaaS) are closely related derivatives of SaaS.
Utility Computing – specialized apps coupled with dynamically reconfigurable resources with often a significant reliance on virtualization for ease of maintenance, portability and scalability.
Managed Services – piecemeal software extensions for existing IT departments such as virus scanners for email or remote desktop managers.
Service Commerce Platforms – a hybrid of SaaS and Managed Services presenting an automated service bureau. Think ADP.
Internet Integration – a combination of any or all of the above, from the same or different providers over a common “service bus,” today in its infancy. The “bus” is a standardized data transfer subsystem which allows different providers’ service elements to be plugged in and swapped out, allowing data to be shared across different providers and giving competitive choice to the user.
These services are provided by “cloud service providers,” also called “cloud vendors” or “cloud providers” for short. A “public cloud” provider is one who purveys services to pretty much anyone on the Internet. The largest public cloud provider in the world is amazon.com’s Amazon Web Services. A “private cloud” is a proprietary network or a data center that supplies hosted services to a limited number of other organizations or people. When public cloud resources are used to create a private cloud, the result is called a “virtual private cloud.” Private or public, cloud computing provides easy, scalable access to computing resources and IT services.