Abstract: Nowadays, a traditional distribution networks are facing many challenges to accommodate renewable energy sources (RES) and plugin electric vehicles (EV). At the same time, distribution network management is undergoing changes to embrace the deregulation of electricity market. Under these challenging conditions, it is mandatory to enable improvements in energy efficiency, network reliability, operational efficiency, security, and safety. A solution for all previous challenges is obtained in the Smart Grid concept. Transition from traditional distribution network to Smart Grid is enabled by technology innovations in power, communication, and information systems. In this brief review a key new technologies are identified as a driving force for the Smart Grid concept implementation. Fault indicators (FI) and remote-controlled switches (RCS) empower the advanced distribution system automation (DSA), thus enabling network self-healing function. Phasor measurement units (PMU) specifically designed for distribution network enable system state awareness at low cost. Advanced metering infrastructure (AMI) representing the first step in transition towards SG concept is empowered by novel Cloud/Fog/Edge computing technology. 5G new radio (NR) communication technology has a potential to be a host for the majority of communication requirements in the future distribution networks through the concept of network slicing. The main objective of this talk is to highlight and explain the role of previous technologies in transition from traditional distribution network to SG.