Infrastructure as a Service (IaaS)

IaaS provides and mantains the underlying hardware, operating system and network Infrastructure resources and provides it in a virtualiced, easy to manage comoditized way. IaaS doesn’t care about the application at all.

IaaS is the base of the Cloud Computing paradigm, many people confuse CC with IaaS, thers just use the term Cloud Computing when they are in fact talking about IaaS. IaaS has also been referred to as "Everything as a Service" and "Hardware as a Service".

IaaS offers CPU, memory, storage, networking and security as a package. IaaS is the virtual machine in the sky.
With IaaS, you can choose from a range of predefined virtual machines and load packaged operating system images to it.
Well known and whidely trusted IaaS providers that offer services to the general public are: Amazon, Joyent, GoGrid and FlexiScale and Rackspace Cloud.

Amazon is probably the best known of the providers, Joyent is also huge and hosts some Facebook applications and the the social network LinkedIn, among others.

By moving your infrastructure to "the cloud", you have the ability to scale as if you owned your own hardware and data center (which is not realistic with a traditional hosting provider) but you keep the upfront costs to a minimum.


Benefits of IaaS:
1. Ability to scale on demand, instantly.
2. Per Hour billing, you only pay for what you use.
3. Ideal for startup business, where one of the most difficult things to do is keep capital expenditures under control.

Database as a Service (DaaS)

A new emerging option called database-as-a-service (DaaS) hosts databases in the cloud and is a good fit for some new apps. Amazon, Google, IBM, Microsoft, Oracle, and Saleforce.com as well as small innovators such as EnterpriseDB, LongJump, and Elastra are all targeting the DaaS market. Although most of today's DaaS solutions are very simple, in the next two to three years, more sophisticated offerings will evolve to support larger and more complex apps.

What Is DaaS?
DaaS provides traditional database features, typically data definition, storage and retrieval, on a subscription basis over the web. To subscribers DaaS appears as a black box supporting logical data operations, and logical data stores where customers can only see their organization's data. Physical access is seen as a security risk and thus it is not available. As with SaaS, DaaS vendors build and manage data centers incorporating best practices in security, back-up, recovery and customer support. Data services typically are provided as SOAP or REST APIs allowing users to define data structures, perform CRUD operations, manage entitlements and query the database using a subset of standard SQL.

Software as a service (SaaS)

Software as a service (SaaS, typically pronounced [sæs]), sometimes referred to as "software on demand," is software that is deployed over the internet and/or is deployed to run behind a firewall on a local area network or personal computer. With SaaS, a provider licenses an application to customers as a service on demand, through a subscription or a "pay-as-you-go" model.

SaaS was initially widely deployed for sales force automation and Customer Relationship Management (CRM). Now, it has become commonplace for many business tasks, including computerized billing, invoicing, human resource management, financials, content management, collaboration, document management, and service desk management.

Cloud Computing

Cloud computing conceptual diagram

Upcoming Technology

Following are the few upcoming technologies -

1)Cloud computing,
2)SaaS(Software as a Service),
3)DaaS(Database as a Service),
4)Platform as-a-Service (PaaS),
5)IaaS(Infrastructure as a Service (IaaS)),
6)IDM(Identity Management)