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Examples: Go Grid
Platform as a Service (PaaS): Developers have traditionally leveraged on-site infrastructure components (servers, storage, networking) to design and deploy applications. PaaS recreates this infrastructure in the cloud, allowing developers to engineer both simple and highly complex applications on a pay-as-you-go basis. PaaS providers also offer resources like development tools, libraries and database management systems, so developers using PaaS don’t have to worry about infrastructure logistics at all.
Example: Google app engine
Software as a Service (SaaS): It refers to applications delivered over the internet on a subscription basis, as opposed to software you pay for and download on the front end. SaaS apps run on a provider’s remote servers, which is why SaaS is also known as “web-based software” or “on-demand software.” You access SaaS apps via your browser. SaaS is popular among businesses and it’s become the most common delivery method for enterprise apps in areas like accounting, enterprise resource planning and virtualization.
Examples: Microsoft Office, Google apps
a) IaaS + PaaS
A PaaS environment will be built upon an underlying infrastructure comparable to the physical and virtual servers and other IT resources provided in an IaaS environment. A cloud provider would not normally need to provision an IaaS environment from its own cloud in order to make a PaaS environment available to cloud consumers.
b) IaaS + PaaS + SaaS
All three cloud delivery models can be combined to establish layers of IT resources that build upon each other. For example, the ready-made environment provided by the PaaS environment can be used by the cloud consumer organization to develop and deploy its own SaaS cloud services that it can then make available as commercial products.
a) Subscription-based: User can pay based on the subscription terms and period.
b) Consumption-based: User can pay according to amount of service which they consumed.
c) Market-based: Company which releases the product, evaluates the prices of similar products which might be future competitors in the market, and based on the features the price may be higher or lower than its competitor.
d) Advertising-based: The product will be either free or low cost, the provider is compensated by advertisers whose ads are delivered along with the product to the consumer.
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