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Network Function Virtualization (NFV) is a new network architecture where network functions that previously implemented on physical hardware called middleboxes or hardware appliances are now running into software on top of general-purpose or Commercial-Off-the-Shelf (COTS) server. The trend towards an innovative architecture initiated from the telecommunication industry and operators (manufactures, network, and carriers) in order to gain maximum benefits from virtualization technology. It not only provides agility and flexibility in the network, but also significantly reduces capital and operational cost. In this paper, state-of-the-art history of NFV is provided. In general, the paper presents the road towards the NFV and then shed lights on usecases of NFV in different fields.