Cloud computing - FAQ Contd...

Kinds of cloud

IaaS (Infrastructure as a Service)
Infrastructure as a Service (IaaS) is the delivery of computer infrastructure (typically a platform virtualization environment) as a service.

Providers: 3tera, Amazon EC2, GoGrid, Nebula: NASA's Cloud Computing Platform (Government-only)

PaaS (Platform as a Service)

Platform as a service (PaaS) the delivery of a computing platform and solution stack as a service. It often goes further with the provision of a software development platform, that is designed for Cloud Computing at the top of the cloud stack.

Providers: SalesForce (, Microsoft (Azure), Google (App Engine)

SaaS (Software as a Service)

Software as a Service (SaaS) - "meaning delivering software over the Internet" is increasingly popular for its ability to simplify deployment and reduce customer acquisition costs; it also allows developers to support many customers with a single version of a product. SaaS is also often associated with a "pay as you go" subscription licensing model.

Providers: SalesForce CRM, Amazon, Microsoft, Google

Types of cloud

Cloud Types
Private Cloud
Private cloud and internal cloud are neologisms that some vendors have recently used to describe offerings that emulate cloud computing on private networks. These (typically virtualization automation) products claim to "deliver some benefits of cloud computing without the pitfalls", capitalising on data security, corporate governance, and reliability concerns.

Public Cloud

Public cloud or external cloud describes cloud computing in the traditional mainstream sense, whereby resources are dynamically provisioned on a fine-grained, self-service basis over the Internet.

Hybrid Cloud

A hybrid cloud environment consisting of multiple internal and/or external providers "will be typical for most enterprises".

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