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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+Definition of terms
+===================
+
+Different standards developing organizations and communities use different
+terminology related to Network Function Virtualization, Cloud Computing, and
+Software Defined Networking. This list defines the terminology in the contexts
+of this document.
+
+
+.. glossary::
+
+    API
+        Application Programming Interface.
+
+    Cloud Computing
+        A model that enables access to a shared pool of configurable computing
+        resources, such as networks, servers, storage, applications, and
+        services, that can be rapidly provisioned and released with minimal
+        management effort or service provider interaction.
+
+    Edge Computing
+        Edge computing pushes applications, data and computing power (services)
+        away from centralized points to the logical extremes of a network.
+
+    Instance
+        Refers in OpenStack terminology to a running VM, or a VM in a known
+        state such as suspended, that can be used like a hardware server.
+
+    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.
+
+    SDN
+        Software-Defined Networking. Emerging architecture that decouples the
+        network control and forwarding functions, enabling the network control
+        to become directly programmable and the underlying infrastructure to be
+        abstracted for applications and network services.
+
+    Server
+        Computer that provides explicit services to the client software running
+        on that system, often managing a variety of computer operations. In
+        OpenStack terminology, a server is a VM instance.
+
+    vForwarder
+        vForwarder is used as generic and vendor neutral term for a software
+        packet forwarder. Concrete examples includes OpenContrail vRouter,
+        OpenvSwitch, Cisco VTF.
+
+    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).
+
+    Virtual network
+        Virtual network routes information among the network interfaces of VM
+        instances and physical network interfaces, providing the necessary
+        connectivity.
+
+    VM
+        Virtual Machine. Virtualized computation environment that behaves like a
+        physical computer/server by modeling the computing architecture of a
+        real or hypothetical computer.
+
+    VNF
+        Virtualized Network Function. Implementation of an Network Function
+        that can be deployed on a Network Function Virtualization
+        Infrastructure (NFVI).
+
+    VNFC
+       Virtualized Network Function Component. A VNF may be composed of
+       multiple components, jointly providing the functionality of the VNF.
+
+    WAN
+        Wide Area Network.