What is IaaS?

Considered the foundation of cloud computing, Infrastructure as-a-Service (IaaS) provides virtualized computing resources over the internet. It is one of the three fundamental service models of cloud computing in addition to Platform as-a-Service (PaaS) and Software as-a-Service (SaaS). In the IaaS model, the user rents hardware, software, servers and storage from a third-party provider rather than purchasing or leasing space in a datacenter. These providers may also host user applications and take care of system maintenance, backup and resiliency planning. Users are given access to the virtualized components in order to build their own IT platforms and are generally responsible for managing applications, data, runtime, middleware and OSes. In the IaaS model, the user is normally only charged for the resources they consume.

IaaS offerings are well-suited for enterprises and workloads that are temporary, experimental or change unexpectedly. An IaaS offering usually provides the following benefits to the user:

  • No Hardware Investments: Hardware is configured and maintained by a third-party cloud provider, saving the user time and money.
  • On-Demand Costs: User only pays for the resources they use.
  • Accessibility: Services can be accessed from any location with an internet connection.
  • Scalability: No delays in expanding capacity or waste of unused capacity, as the resource are available as is and when the client needs it.
  • Data Center Security: Because the services are hosted externally with a third-party cloud provider, the user benefits from the physical security of the servers that are hosted in the data center.
  • No Single point of Failure: Based off of the amount of hardware resources and redundancy configurations, the IaaS service can still run successfully despite failure from a server, network switch or the data center.


To learn more about as-a-Service offerings, visit KeyCloud’s Cloud Services