Cloud
Overview
Really this is just some application or service that runs on someone else's Servers. M365 and Google Workspace are "cloud services" that give you productivity and collaboration tools. Azure is a cloud service that allows you to have Virtual Servers on Microsoft owned equipment (among other things). PCO (Planning Center Online) is a Church Management System that runs on servers PCO owns and operates. Hosting your website with something like Rackspace is technically cloud, even if you are paying for a "dedicated server" because you do not own or operate the physical equipment. The most typical models for delivery of Cloud services are SaaS, IaaS, and PaaS.