(1) A client-side operating system for a user's PC, such as Google's Chrome, that is designed to load all applications from the Internet or local network (the cloud). See Chrome OS.
(3) A server-side operating system for a cloud computing environment. It may refer to the OS alone or to the virtual machine monitor (VMM) or to both components, as both are required for the virtualized environment commonly deployed in cloud computing. See cloud computing, virtual machine monitor and server virtualization.