Your CIO has asked you to investigate cloud computing vendors. You have been tasked to find vendors that offer virtual servers on demand and allow administrative access to the servers so they can be configured with your employer's software as needed. Which cloud model is your CIO looking for?
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Answer Description
Your CIO is looking for Infrastructure as a Service (IaaS). This model aims to automate the provisioning and creation of infrastructure like physical servers, networks and virtual machines. Most commonly an IaaS vendor will provide a virtual machine with a pre-installed operating system and provide access to you to configure based on your needs.
Wikipedia
Infrastructure as a service (IaaS) is a cloud computing service model by means of which computing resources are supplied by a cloud services provider. The IaaS vendor provides the storage, network, servers, and virtualization (which mostly refers, in this case, to emulating computer hardware). This service enables users to free themselves from maintaining an on-premises data center. The IaaS provider is hosting these resources in either the public cloud (meaning users share the same hardware, storage, and network devices with other users), the private cloud (meaning users do not share these resources), or the hybrid cloud (combination of both).It provides the customer with high-level APIs used to dereference various low-level details of underlying network infrastructure like backup, data partitioning, scaling, security, physical computing resources, etc. A hypervisor, such as Xen, Oracle VirtualBox, Oracle VM, KVM, VMware ESX/ESXi, or Hyper-V runs the virtual machines as guests. Pools of hypervisors within the cloud operational system can support large numbers of virtual machines as well as the ability to scale services up and down according to customers' varying requirements.
Infrastructure_as_a_service - Wikipedia, the free encyclopedia 