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Infrastructure as a service (IaaS) is a service model that delivers computer infrastructure on an outsourced basis to support enterprise operations. Typically, IaaS provides hardware, storage, servers and data center space or network components; it may also include software.
Infrastructure as a service (IaaS) is also known as hardware as a service (HaaS).
An IaaS provider provides policy-based services and is responsible for housing, operating and maintaining the equipment it provides for a client. Clients usually pay on a per-use or utility computing basis.
Characteristics of IaaS include:
IaaS is also described as one of three main categories of cloud computing service. The other two are software as a service (SaaS) and platform as a service (PaaS).