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Service Delivery

Cloud services delivery can be broadly divided into main three models. This is called as SPI model. : Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS).

Software as a Service (SaaS)

Software applications delivered from the cloud using multi-tenancy and accessible by various devices using a web browser. the vendor supplies the hardware infrastructure and the software product . SaaS is a very broad market. Services can be anything from Web-based email to inventory control and database processing. Because the service provider hosts both the application and the data, the end user is free to use the service from anywhere.

Platform as a Service (PaaS)

Application platform that completely abstracts all the complexities of the underlying infrastructure and delivered as a service for the users to deploy applications that can be accessed over the network. Developers create applications on the provider's platform over the Internet. PaaS providers may use APIs, website portals or gateway software installed on the customer's computer. Developers need to know that currently, there are not standards for interoperability or data portability in the cloud. Some providers will not allow software created by their customers to be moved off the provider's platform.

Infrastructure as a Service (IaaS)

Raw compute power and storage offered as a service with a metered billing where users can deploy and run different software from operating systems to platforms to applications. Services provides virtual server instance (API) to start, stop, access and configure their virtual servers and storage. In the enterprise, cloud computing allows a company to pay for only as much capacity as is needed, and bring more online as soon as required. Because this pay-for-what-you-use model resembles the way electricity, fuel and water are consumed, it's sometimes referred to as utility computing.