Technical Terms related with Cloud Computing

Advertising-based pricing model
A pricing model whereby services are offered to customers at low or no cost, with the service provider being compensated by advertisers whose ads are delivered to the consumer along with the service.

Amazon EC2
Amazon’s Elastic Compute Cloud Web service, which provides resizable computing capacity in the cloud so developers can enjoy great scalability for building applications.

Amazon S3
Amazon Simple Storage Services — Amazon’s cloud storage service.

CDN
Content delivery network — A system consisting of multiple computers that contain copies of data, which are located in different places on the network so clients can access the copy closest to them.

Cloud
A metaphor for a global network, first used in reference to the telephone network and now commonly used to represent the Internet.

Cloud broker
An entity that creates and maintains relationships with multiple cloud service providers. It acts as a liaison between cloud services customers and cloud service providers, selecting the best provider for each customer and monitoring the services.

Cloud operating system
A computer operating system that is specially designed to run in a provider’s datacenter and be delivered to the user over the Internet or another network. Windows Azure is an example of a cloud operating system or “cloud layer” that runs on Windows Server 2008. The term is also sometimes used to refer to cloud-based client operating systems such as Google’s Chrome OS.

Cloud Oriented Architecture
A term coined by Jeff Barr at Amazon Web Services to describe an architecture where applications act as services in the cloud and serve other applications in the cloud environment.

Cloud portability
The ability to move applications and data from one cloud provider to another. See also Vendor lock-in.

Cloud provider
A company that provides cloud-based platform, infrastructure, application, or storage services to other organizations and/or individuals, usually for a fee.

Cloud storage
A service that allows customers to save data by transferring it over the Internet or another network to an offsite storage system maintained by a third party.

Cloudsourcing
Replacing traditional IT services with cloud services.

Cloudstorming
Connecting multiple cloud computing environments.

Cloudware
Software that enables creating, deploying, running, or managing applications in the cloud.

Cluster
A group of linked computers that work together as if they were a single computer, for high availability and/or load balancing.

Consumption-based pricing model
A pricing model whereby the service provider charges its customers based on the amount of the service the customer consumes, rather than a time-based fee. For example, a cloud storage provider might charge per gigabyte of information stored. See also Subscription-based pricing model.

Customer self-service
A feature that allows customers to provision, manage, and terminate services themselves, without involving the service provider, via a Web interface or programmatic calls to service APIs.

Disruptive technology
A term used in the business world to describe innovations that improve products or services in unexpected ways and change both the way things are done and the market. Cloud computing is often referred to as a disruptive technology because it has the potential to completely change the way IT services are procured, deployed, and maintained.

Elastic computing
The ability to dynamically provision and de-provision processing, memory, and storage resources to meet demands of peak usage without worrying about capacity planning and engineering for peak usage.

External cloud
Public or private cloud services that are provided by a third party outside the organization.

Hosted application
An Internet-based or Web-based application software program that runs on a remote server and can be accessed via an Internet-connected PC or thin client. See also SaaS.

Hybrid cloud
A networking environment that includes multiple integrated internal and/or external providers.

IaaS
Infrastructure as a service — Cloud infrastructure services, whereby a virtualized environment is delivered as a service over the Internet by the provider. The infrastructure can include servers, network equipment, and software.

Internal cloud
A type of private cloud whose services are provided by an IT department to those in its own organization.

Mashup
A Web-based application that combines data and/or functionality from multiple sources.

Microsoft Azure
Microsoft cloud services that provide the platform as a service (see PaaS), allowing developers to create cloud applications and services.

Middleware
Software that sits between applications and operating systems, consisting of a set of services that enable interoperability in support of distributed architectures by passing data between applications. So, for example, the data in one database can be accessed through another database.

On-demand service
A model by which a customer can purchase cloud services as needed; for instance, if customers need to utilize additional servers for the duration of a project, they can do so and then drop back to the previous level after the project is completed.

PaaS
Platform as a service — Cloud platform services, whereby the computing platform (operating system and associated services) is delivered as a service over the Internet by the provider.

Pay as you go
A cost model for cloud services that encompasses both subscription-based and consumption-based models, in contrast to traditional IT cost model that requires up-front capital expenditures for hardware and software.

Private cloud
Services offered over the Internet or over a private internal network to only select users, not available to the general public.

Public cloud
Services offered over the public Internet and available to anyone who wants to purchase the service.

SaaS
Software as a service — Cloud application services, whereby applications are delivered over the Internet by the provider, so that the applications don’t have to be purchased, installed, and run on the customer’s computers. SaaS providers were previously referred to as ASP (application service providers).

Salesforce.com
An online SaaS company that is best known for delivering customer relationship management (CRM) software to companies over the Internet.

Service migration
The act of moving from one cloud service or vendor to another.

Service provider
The company or organization that provides a public or private cloud service.

SLA
Service level agreement — A contractual agreement by which a service provider defines the level of service, responsibilities, priorities, and guarantees regarding availability, performance, and other aspects of the service.

Subscription-based pricing model
A pricing model that lets customers pay a fee to use the service for a particular time period, often used for SaaS services. See also Consumption-based pricing model.

Utility computing
Online computing or storage sold as a metered commercial service in a way similar to a public utility

Vendor lock-in
Dependency on the particular cloud vendor and difficulty moving from one cloud vendor to another due to lack of standardized protocols, APIs, data structures (schema), and service models.

Vertical cloud
A cloud computing environment that is optimized for use in a particular industry, such as health care or financial services.

Virtual private data center
Resources grouped according to specific business objectives.

VPC
Virtual private cloud — A private cloud that exists within a shared or public cloud, e.g., the Amazon VPC that allows Amazon EC2 to connect to legacy infrastructure on an IPsec VPN.

What is Cloud Bursting in Cloud Computing

Cloud bursting is an application deployment model in which an application runs in a private cloud or data center and bursts into a public cloud when the demand for computing capacity spikes. The advantage of such a hybrid cloud deployment is that an organization only pays for extra compute resources when they are needed.

Cloud bursting is recommended for high performance, non-critical applications that handle non-sensitive information, it works best for applications that don’t depend on a complex application delivery infrastructure or integration with other applications, components and systems internal to the data center.

What’s the Difference Between Virtualization and Cloud Computing?

Virtualization is the process of simulating “virtual” versions of infrastructure resources, such as computing environments, operating systems, storage devices or network components, as opposed to creating actual or physical versions of those same resources.
For example, you have a physical server (the “host”) that controls all of its physical resources (the operating system, memory, storage, etc.) – those resources can be allocated to virtual machines (“VM”s) that run in containers provided by that host. Virtualization enables multiple instances of infrastructure resources to run on the same hardware, with access to those resources being controlled by a hypervisor, also referred to as a virtual machine manager (“VMM”), is the software layer that controls access to the host’s physical hardware, and creates and runs the VMs. There are two types of hypervisors: bare metal/native or hosted. In a bare metal instance, the hypervisor runs directly on the host’s hardware and allows running multiple operating systems on the same physical hardware. Hosted hypervisors run on top of the host’s operating system, and additional operating system environments are run within the host’s OS.

where as

Cloud computing is the delivery of shared computing resources, software or data as a service via the Internet, as opposed to virtualization, which is part of a physical infrastructure. For users of either technology, it may appear that the two are one in the same, as the applications or data they’re accessing are pulled from a virtual machine somewhere unconnected to a physical host. That’s partly where some of the confusion happens.

Cloud computing is built on top of a virtualized infrastructure, consisting of compute, storage and network components. There are a variety of different service models that represent cloud computing, such as SaaS, IaaS, and PaaS.
There are many key characteristics that define the “cloud”, such as agility, scalability, automation, and on-demand service delivery.

What is Cloud Computing?

Cloud computing is a colloquial expression used to describe a variety of different types of computing concepts that involve a large number of computers that are connected through a real-time communication network (typically the Internet).

Cloud computing is comparable to grid computing, a type of computing where unused processing cycles of all computers in a network are harnesses to solve problems too intensive for any stand-alone machine.

These services are broadly divided into three categories:

Infrastructure-as-a-Service (IaaS)

IAAS is a standardized, highly automated offering, where compute resources, complemented by storage and networking capabilities are owned and hosted by a service provider and offered to customers on-demand. Customers are able to self-provision this infrastructure, using a Web-based graphical user interface that serves as an IT operations management console for the overall environment.

Platform-as-a-Service (PaaS)

PAAS is a category of cloud computing services that provides a computing platform and a solution stack as a service.
Along with software as a service (SaaS) and infrastructure as a service (IaaS), it is a service model of cloud computing. In this model, the consumer creates the software using tools and/or libraries from the provider. The consumer also controls software deployment and configuration settings. The provider provides the networks, servers, storage, and other services.
PaaS offerings facilitate the deployment of applications without the cost and complexity of buying and managing the underlying hardware and software and provisioning hosting capabilities.

Software-as-a-Service (SaaS)

SaaS is a software delivery method that provides access to software and its functions remotely as a Web-based service.
Software as a Service allows organizations to access business functionality at a cost typically less than paying for licensed applications since SaaS pricing is based on a monthly fee.
Also, because the software is hosted remotely, users don’t need to invest in additional hardware. Software as a Service removes the need for organizations to handle the installation, set-up and often daily upkeep and maintenance. Software as a Service may also be referred to as simply hosted applications.