Infrastructure as a Service (IaaS) What is Infrastructure as a Service (IaaS)? Infrastructure as a Service (IaaS) is a cloud computing model that provides virtualised computing resources, such as servers, storage, and networking, on a pay-as-you-go basis. Explanation IaaS eliminates the need for businesses to invest in and maintain physical hardware. It offers flexibility and scalability, allowing organisations to expand or reduce resources as needed. Practical Example of Infrastructure as a Service A startup uses IaaS to quickly deploy and scale its web application without investing in on-premises hardware, saving costs and time.