Cloud = Internet: Metaphor used to represent a global network, initially used to refer to phone networks and now used to represent the Internet.
Elastic Computing : Ability to add and remove computing resources such as processing, memory and storage, without affecting the level of service.
Private Cloud Computing: Services provided over the Internet or the company’s internal network to selected users, not available to the general public. A cloud service provider can offer a private cloud to a customer, or a company can have its own cloud.
Public Cloud Computing: Services offered on the internet to anyone who wants to buy.
Hybrid cloud Computing: Network environment that includes internal and external computing services.
Vertical Cloud Computing: Cloud computing offer that is optimized for a specific business vertical as finance or health.
IaaS (Infrastructure as a Service structure): Also Haas (Hardware as a Service), are offered on virtualized computing resources as a service over the Internet. Typically include dedicated servers, network, software, or even desktops (DaaS, Desktop as a Service)
SaaS (Software as a Service): Specific applications offered as a service on the Internet, without requiring installation on the user machine.
PaaS (Platform as a Service): On-demand computing where all the components and associated services are offered on the internet.