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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.