Infrastructure as a Service (IaaS) is a form of cloud computing that provides virtualized computing resources over the internet. IaaS allows organizations to outsource the hardware and software components of their IT infrastructure, such as servers, storage, networking, and operating systems, by providing access to physical or virtual machines in a pay-as-you-go model. This allows organizations to reduce their capital expenditure costs and enables them to scale their resources up or down quickly according to their changing business needs.