Infrastructure as a Service (IaaS) is online, often cloud orchestrated services that provide essential computing, storage, and networking resources on demand. Organizations that use IaaS can shift some or all their use of on-location or collated data center infrastructure to the cloud. In the IaaS model, the cloud provider owns and operates the hardware and software and owns or leases the data center. In a typical IaaS configuration, a business - which can be any size - uses services like computing, storage, and databases from a cloud provider. The cloud provider offers those services by hosting hardware and software in the cloud with virtual machines such as Xen, Oracle, Hyper-V, and VMware. The business no longer needs to purchase and manage its own server and infrastructure equipment or use up the space for hosting. Most costs are on a pay-as-you-go-model. When the business needs less, they pay less. And as it grows, the IaaS model can scale through additional reserve pooling and other technology in less than hours.