Cloud computing
Cloud computing is a model for enabling ever-present, on-demand broad network access to a common supply of configurable computing resources, such as networks, servers, applications and services, and storage. The resources can be rapidly deployed and implemented; fully flexible and scalable, little service provider involvement is required and costs are kept to a minimum.

Cloud auditor
A cloud auditor channels independent assessment of cloud services, system operations and the security of the cloud implementation.

Cloud broker
A cloud broker is an entity that controls the use, performance and delivery of cloud services, and mediates the relationship between cloud providers and cloud consumers.

Cloud carrier
The intermediary providing connectivity and transport of cloud services from cloud providers to cloud consumers.

Cloud consumer
The cloud consumer is an individual or business perpetuating a professional relationship with a cloud provider whilst utilizing their services.

Cloud provider
The cloud provider is an individual or organization responsible for offering a service to all interested parties.

Cloud options:
Public cloud:  several companies share physical servers and networking resources.
Private cloud: companies do not share resources. Private clouds are found in the provider’s data center or the company’s own data center.
Hybrid cloud: virtualized applications can be located in private and public clouds.

Data center
The data center is a building that provides housing for computer systems, telecommunications and storage systems. It maintains the mainframes, servers and databases of IT systems

Domain name registrar
A domain name registrar is an ICANN (Internet Corporation for Assigned Names and Numbers) accredited company, granted the authority to register domain names for companies or individuals wanting to own a specific website address. The registrar receives a fee to maintain the registration of the name, ensuring it cannot be acquired by another person.

Domain name registry
A domain name registry (a.k.a. Network Information Center (NIC) – is a database of all domain names registered in a top level domain (TLD). A registry may only operate if the TLD they administrate has been delegated to them by IANA (Internet Assigned Numbers Authority); confusion is eliminated by ensuring there is only one registry per TLD.

Hosted virtual desktop
A hosted virtual desktop (HVD) or virtual desktop infrastructure (VDI) looks and acts like a regular desktop PC but it is run as a virtual machine (VM with the software and data hosted in a data center, then accessed remotely from wherever you are. Secure access is achieved over an Internet connection from your PC, laptop, iPad, mobile phone etc.

Empowered by the cloud:
SaaS (Software as a Service) is software owned, implemented and administrated remotely in the cloud. The provider offers the software as pay-as-you-go or subscription based.
PaaS (Platform as a Service) is a service model offering a collection of application infrastructure services. The platform will usually include operating system, database and web server; developers can utilize software on a cloud platform at an affordable cost and reduced administration.
IaaS (Infrastructure as a Service) involves service providers offering computers, usually virtual, for cloud computing; includes hosting, storage and a complete development environment.

Independent software vendor
An Independent software vendor (ISV) is a software producer that develops packages for the market but they are not managed by a hardware manufacturer. Their primary function is to distribute software to run on operating systems administered by another entity. ISVs, generally, offer products that leading vendors (i.e. IBM, Microsoft) do not offer. ISVs create competition in the price market, they also inspire technological innovation.

Syndicated cloud service
A syndicated cloud service allows service providers to provide and invoice customers for the cloud service whilst a third party manages the infrastructure behind.

System integrator
A systems integrator (SI) is an individual or business that builds computer systems, combining hardware and software from several vendors. An SI will implement, plan, schedule, test and maintain a computing operation. Customers employing an SI will benefit from cost effective ‘off the shelf’ software, rather than purchasing highly priced customized packages.

Unified communications
Unified communications (UC), the amalgamation of real-time communication services such as instant messaging (IM), presence information, telephony (including IP telephony), video conferencing, data sharing, call control and speech recognition with non-real-time communication services such as unified messaging (integrated voicemail, email, SMS and fax). UC uses mixed products to give a consistent unified user interface and user experience across multiple devices.

Value-added reseller 
A value-added reseller (VAR) is an individual or company that purchases a product from a vendor and enhances the value by adding complementary products and/or services. A VAR will assemble, augment, modify and repackage to suit customers’ needs. A VAR may also offer additional hardware, implementation, consulting, training, and troubleshooting.