Cloud computing Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing cloud computing and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • P

    private PaaS (private platform as a service)

    Private platform as a service (private PaaS) is software that facilitates development, deployment and operations for IT on a private infrastructure or behind a firewall.

  • public cloud

    A public cloud is a platform that uses the standard cloud computing model to make resources, such as virtual machines (VMs), applications or storage, available to users remotely.

  • R

    Racemi

    Racemi is a data center software vendor that specializes in cloud provisioning and cloud migration products. Racemi’s products enable physical-to-cloud (P2C), cloud-to-physical (C2P) and cloud-to-cloud (C2C) migration.

  • Rackspace Fanatical Support

    Rackspace Fanatical Support is Rackspace's customer service program, which provides support for customers using its managed hosting services and cloud platforms.

  • Red Hat OpenShift

    Red Hat OpenShift is a multifaceted, open source container application platform from Red Hat Inc. for the development, deployment and management of applications.

  • RightScale Inc.

    RightScale is a software as a service (SaaS) provider that offers cloud management and analytics tools for public, private and hybrid clouds.

  • S

    Scalr

    Scalr is an information technology (IT) vendor that offers a management platform for cloud computing.

  • shadow IT

    Shadow IT is hardware or software that is not supported by an organization's IT department.  The term often carries a negative connotation because it implies the IT department has not approved the technology or doesn’t even know that employees are using it.

  • shared responsibility model

    A shared responsibility model is a cloud security framework that dictates the security obligations of a cloud computing provider and its users to ensure accountability.

  • single-tenancy

    Single-tenancy is an architecture in which a single instance of a software application and supporting infrastructure serves one customer.  In the software-as-a-service (SaaS) delivery model, a customer is called a tenant. 

  • SnapLogic

    SnapLogic is a software company that offers cloud integration products to allow customers to connect cloud-based data and applications with on-premise business systems.

  • Software as a Service (SaaS)

    Software as a service (SaaS) is a software distribution model in which a third-party provider hosts applications and makes them available to customers over the Internet.

  • SPI model

    SPI is an acronym for the most common cloud computing service models, software as a service, platform as a service and infrastructure as a service.

  • subscription-based pricing model

    A subscription-based pricing model is a payment structure that allows a customer or organization to purchase or subscribe to a vendor's IT services for a specific period of time for a set price.

  • T

    Testing as a Service (TaaS)

    Testing as a Service (TaaS) is an outsourcing model in which testing activities associated with some of an organization’s business activities are performed by a service provider rather than employees.

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