_____ is a computing model in which an organization outsources the equipment used to support its business operations, including storage, hardware, servers, and networking components.

Cloud computing is the provision of computer resources (such as computing power and storage) to users without the need for them to manage these resources. Cloud resources can be deployed to one organization or multiple organizations at the same time. Companies who are cloud provides usually use the pay-as-you-go method of billing customers, hence the need for system administrators to be familiar with cloud pricing methods.

There are several service models for Cloud computing, they are:

Infrastructure as a service (IaaS)
Software as a service (SaaS)
Platform as a service (PaaS)
Mobile Backend as a service (MBaaS)
Function as a service (FaaS) and
Serverless Computing.

Infrastructure as a service (IaaS) is a cloud service model that provides physical computing resources, networking components, servers, storage and so on. Resources containing large categories of equipment are made available to users from data centers. Operating Systems and application software are installed on the cloud infrastructure bought.