The acronym "XaaS" refers to "Everything as a Service" in the context of service models. It denotes a broad range of services that are delivered over the internet, encompassing various types of cloud computing offerings. This model includes Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS), among others. XaaS enables organizations to leverage on-demand resources, reduce capital expenditures, and enhance flexibility in scaling operations as business needs change.