Infrastructure, Platform,software as a Service

1. Infrastructure as a Service (IaaS): It is a method of delivering computing, storage, networking and other capabilities via the Internet. IaaS enables companies to utilize web-based operating systems, applications and storage without having to purchase, manage and support the underlying cloud infrastructure. The most popular examples of IaaS platforms include Amazon Web Services (AWS) and Microsoft Azure.

Examples: Go Grid

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Features:

• Instead of purchasing hardware outright, users pay for IaaS on demand.
• Infrastructure is scalable depending on processing and storage needs.
• Saves enterprises the costs of buying and maintaining their own hardware.
• Because data is on the cloud, there can be no single point of failure.
• Enables the virtualization of administrative tasks, freeing up time for other work.

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

Features:

• PaaS provides a platform with tools to test, develop and host applications in the same environment.
• Enables organizations to focus on development without having to worry about underlying infrastructure.
• Providers manage security, operating systems, server software and backups.
• Facilitates collaborative work even if teams work remotely.

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

Features:

• SaaS vendors provide users with software and applications via a subscription model.
• Users do not have to manage, install or upgrade software; SaaS providers manage this.
• Data is secure in the cloud; equipment failure does not result in loss of data.
• Use of resources can be scaled depending on service needs.
• Applications are accessible from almost any internet-connected device, from virtually anywhere in the world.

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.