With the development of computer networks, the defects of traditional Transmission Control Protocol/Internet Protocol (TCP/IP)-based architecture have been amplified. Traditional computer networks are facing big challenges. To break a closed traditional network for eliminating defects and promoting network innovation, software-defined networking (SDN) has been proposed. In this chapter, we illustrate SDN and discuss future network research. We also give a brief overview of recent advances in SDN. Finally, we summarize our work related to SDN in datacenter networks.