IaaS is a model that offers the computing infrastructure as an on-demand service. You can, therefore, purchase virtual machines, on which you can run your own software, storage resources (with the possibility of rapidly increasing or reducing the storage capacity based on your needs), networks, and OS by paying based on what you actually use. A dynamic infrastructure of this type adds greater scalability, while also significantly reducing costs.

This model is used both by small emerging companies that do not have large capital to invest and by established companies seeking to streamline their hardware architecture. The range of IaaS sellers is very wide, including Amazon Web Services, IBM, and Oracle.