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+.. _glossary:
+
+Glossary
+========
+
+.. glossary::
+
+    Vendor
+      a vendor is the entity that provides the network function.
+
+    VSP (Vendor Software Product)
+      a VSP is the package of the network function seen from ONAP Designer
+
+    VF (Virtual Function)
+      a VF is the virtual function using the VSP. The VF will be used by
+      services.
+
+    Service
+      a service is the model that can be instantiated. it's composed of one (or
+      several) Functions (VF or PNF).