Hypervisor, A software abstraction layer that runs VMs as application, Windows Virtual PC, An example of hosted hypervisors, Public, Infrastructure open to general public, Private, Single organization, though it is shared among multiple divisions or business units., Community, Shared between a number of organizations which have common concerns and needs., Hybrid, Combination of public and private, and community, VDI, A remote server hosting a virtualized user OS, Persistent VDI, Each user runs their own copy of virtual desktop and have data and personal settings are saved, Non-persistent VDI, Shared with multiple users, no personal data/settings can be saved. Remain default setting after each used, PaaS, Offer applications developing platforms, SaaS, Offer accounts of applications login remotely, IaaS, Offer hardware and software renting remotely, Measured service, Charge by period (monthly/yearly and planned for each period), Metered service, Charge by each usage

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