NCT (Korean: 엔시티) is a South Korean boy group formed by SM Entertainment. Since the group's initial introduction by their native label's founder in January 2016, the group consists of 23 members as of January 2021, ranging from their late-teens to mid-twenties and participating in a total of four different sub-units. The group introduced their first unit, the rotational NCT U, on April 9, 2016 with the double digital single "The 7th Sense" and "Without You". It was followed by the Seoul-based unit NCT 127 on July 7, 2016 with their eponymous extended play and later the then-teenage only unit NCT Dream on August 24, 2016 with the digital single "Chewing Gum". The group then introduced their first overseas localized sub-unit WayV, a seven-member unit based in China, on January 17, 2019 with the single album The Vision. A fifth unit is set to debut in 2021. Along with separate activities of each group unit, the umbrella group NCT to date has united twice to promote full-length albums, the first time being the 2018 March release of NCT 2018 Empathy and the second was the 2020 October and November release of the two-part album NCT 2020 Resonance Pt. 1 and Pt. 2 which together sold over 2.6 million copies within two months, establishing itself as the highest-selling physical album ever released by an act from SM entertainment and earned the group their first Grand Daesang Award at the 2020 Asia Artist Awards.