Nct
In short
NCT is a South Korean boy band formed by SM Entertainment that operates through a unique system of unlimited members and sub-units.
In plain words
Instead of one fixed group, NCT is made of several smaller teams like NCT 127 or NCT Dream. New members can join at different times, and the groups focus on different musical styles.
A simple example
A fan might follow the unit NCT Dream for bright, youthful pop songs, while following NCT 127 for a more experimental hip-hop sound.
Why it matters
This system allows the company to release music constantly without the members burning out. It also lets different types of fans find the specific musical style they enjoy most.
Easy to mix up
Do not confuse NCT with K-pop groups that have a fixed, permanent number of members.