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**Definition of terms**

Different SDOs and communities use different terminology related to
NFV/Cloud/SDN. This list tries to define an OPNFV terminology,
mapping/translating the OPNFV terms to terminology used in other contexts.

.. glossary::

   NFV
      Network Function Virtualization

   NFVI
      Network Function Virtualization Infrastructure; totality of all hardware
      and software components which build up the environment in which VNFs are
      deployed.

   VNF
      Virtualized Network Function. Implementation of an Network Function that
      can be deployed on a Network Function Virtualization Infrastructure (NFVI).

   VIM
      Virtualized Infrastructure Manager; functional block that is responsible
      for controlling and managing the NFVI compute, storage and network
      resources, usually within one operator's Infrastructure Domain, e.g. NFVI
      Point of Presence (NFVI-PoP).

   NFVO
      Network Functions Virtualization Orchestrator; functional block that
      manages the Network Service (NS) lifecycle and coordinates the management
      of NS lifecycle, VNF lifecycle (supported by the VNFM) and NFVI resources
      (supported by the VIM) to ensure an optimized allocation of the necessary
      resources and connectivity.

   VNFM
      Virtualized Network Function Manager; functional block that is responsible
      for the lifecycle management of VNF.

   Consumer
      User-side Manager; consumer of the interfaces produced by the VIM; VNFM,
      NFVO, or Orchestrator in ETSI NFV [7] terminology.

   Administrator
      Administrator of the system, e.g. OAM in Telco context.

   Virtual Machine (VM)
      Virtualized computation environment that behaves very much like a physical
      computer/server.

   Virtual Storage
      Virtualized non-volatile storage allocated to a VM.

   Virtual network
      Virtual network routes information among the network interfaces of VM
      instances and physical network interfaces, providing the necessary
      connectivity.

   Physical resource
      Actual resources in NFVI; not visible to Consumer.

   Virtual resource
      A Virtual Machine (VM), a virtual network, or virtualized storage; Offered
      resources to "Consumer" as result of infrastructure virtualization; visible
      to Consumer.