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Private Clouds – A private CLOUD consists of computing resources used exclusively by ONE business or organisation. The private cloud can be physically located at organisation’s on-site data CENTER or it can be hosted by a third-party service provider. private cloud, the services and infrastructure are always maintained on a private network and the hardware and software are dedicated solely to your organisation.

Advantages Of Private Cloud:

• Provide cloud has more customizable security options and capabilities to meet organization requirement for internal users with business growth and be expanded or changed as NEEDED compare to public cloud

Disadvantages Of Private Cloud:

• Management and IT department stake holder should be in same page to make private cloud
• Private cloud NEEDS huge capital investment in the initial phase
• It takes long time to deliver services compare to public cloud

Cloud types depends how to describe the services are delivered as well as underlying OWNERSHIP. Cloud deployment types describe the nature of the SPECIALISED services that are offered.

Public Clouds – Public Clouds- Public cloud is the most  common and popular cloud option adopted by users. The IT INFRASTRUCTURE resources like compute, network, storage in secured manner at low cost is available at public cloud environment. these IT infrastructures are shared amongst multiple clients therefore it is cheaper to use. All the resources are accessed and managed by web browser over internet.Public cloud services provided offering are Infrastructure as a service (IaaS), platform as a Service (PaaS) ans Software as a service (SaaS). Some of the public cloud offering are office 365, salesforce etc.

Advantage of Public Cloud:

• Economics of scale as PER unit cost reduces with increase in consumption volume
• It reduces time to MARKET and brings agility in business
• Users can increase and reduce consumption of resource dynamically depending on business requirement.

Disadvantages Of Public Cloud:

• Fewer options for customization
• Less secure compare to private cloud or on premises Data center
• Fixed architecture cannot (at times) grow with the needs of the business

The globalization of business, difficult ECONOMIC environment and the on-demand CONSUMPTION model for consumers have increased the pressure on organizations to be AGILE and cost effective. Cloud computing helps organization to competitive and expand. The key drivers of cloud computing are cost, risk and agility. The cloud computing drivers are depicted in below DIAGRAM:

Cloud Computing is a collection of layers formed TOGETHER to deliver a IP based computing, virtualization is a layer/module inside cloud computing architecture which will enable the providers to deliver the IaaS "Infrastructure as a Service" on the fly.

Virtualization is a Software which creates “separated” MULTIPLE images of the hardware and software on the same machine. This makes POSSIBLE to INSTALL multiple OS, multiple software and multiple applications on the same physical machine.

• Virtualization: More Servers on the Same Hardware;
• Cloud Computing: Measured Resources, Service based delivery, Pay for What You Use.

National Institute of Standards and Technology(NIST) defined Cloud computing  as a model facilitate on-demand globally accessible network to a shared pool of computing resources (e.g., networks, SERVERS, STORAGE, applications, and services) that can be provisioned by self service portal  provided by cloud service provider.

Cloud Computing is a new class of network based computing services that is available over the INTERNET, This model is similar to Utility Computing a collection/group of integrated and networked hardware, software and Internet infrastructure (called a platform).

1. Internet based web service provides hardware, software and networking services to end users
2. These cloud platforms provides simple GUI and APi (Application Programming interface) to access web based computing resources hiding underlying infrastructure details and complexity to end users.
3. In addition, the platform provides on demand services, that are always on, ANYWHERE, anytime and any place.
4. Pay for USE and as on demand, elastic
5. scale up and down in capacity
6. The hardware and software services are available to everyone e.g public, enterprises, corporations and businesses markets