Difference between SDN and NFV:

SDN	NFV
SDN architecture mainly focuses on data centers.	NFV is targeted at service providers or operators.
SDN separates the control plane and data forwarding plane by centralizing control and programmability of the network.	NFV helps service providers or operators to virtualize functions like load balancing, routing, and policy management by transferring network functions from dedicated appliances to virtual servers.
SDN uses OpenFlow as a communication protocol.	There is no protocol determined yet for NFV.
SDN supports Open Networking Foundation.	NFV is driven by the ETSI NFV Working group.
Various enterprise networking software and hardware vendors are initiative supporters of SDN.	Telecom service providers or operators are prime initiative supporters of NFV.
Corporate IT act as a Business initiator for SDN.	Service providers or operators act as Business initiators for NFV.
SDN applications run on industry-standard servers or switches.	NFV applications run on industry-standard servers.
SDN reduces the cost of the network because now there is no need for expensive switches & routers.	NFV increases scalability and agility as well as speeds up time-to-market as it dynamically allots hardware a level of capacity to network functions needed at a particular time.
Application of SDN: ·         Networking ·         Cloud orchestration	Application of NFV: ·         routers, firewalls, gateways ·         WAN accelerators ·         SLA assurance ·         Video Servers ·         Content Delivery Networks (CDN)