In this chapter, the Soft Open Point (SOP), an emerging power electronics device in distribution networks, is introduced. SOPs can be installed to replace the normally open points (NOPs) in distribution networks to achieve the flexible connection between feeders and the upgrade from radial to closedloop configuration. Under normal operation, SOPs can provide active power flow control, reactive power compensation, and voltage regulation; under fault conditions, SOPs offer post fault supply restoration. In this chapter, the basic concept of the SOP and its benefits are explained; a comparison between SOPs and other power electronic devices used in distribution networks is provided; the modeling method of SOPs, along with their placement and sizing in active distribution networks are reviewed.