Hypervisor - A software abstraction layer that runs VMs as application, Type 1 Hypervisor - runs directly on the physical hardware of a server, 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, PaaS - Offer applications developing platforms, SaaS - Offer accounts of applications login remotely, IaaS - Offer hardware services renting remotely, Measured service - Charge by period (monthly/yearly and planned for each period), Metered service - Charge by each usage, Type 2 Hypervisor - run as an application within a host OS, Rapid Elasticity  - the ability of a cloud system to quickly scale resources up or down, automatically, to meet fluctuating demands,

CompTIA A+ Cloud Computing

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