Super Junior is a popular Korean boy band under SM Entertainment that debuted in 2005 with 12 members but added one more in 2006. Currently there are 8 active members due to some leaving or being on hiatus for mandatory military service or other pursuits. The document discusses the band's history and formation process, and introduces their sub-units Super Junior-K.R.Y, Super Junior-T, Super Junior-M, and Super Junior-Happy. It also defines E.L.F as the official fan club name for Super Junior fans.