Genjei (Earth-2356)

Genjei is one of the main Force technique categories. Unlike jenjei, the effects of genjei are not real, being only sensory illusions experienced by those who fall victim to it. According to the Second Grand Master of the Jedi Order, Gengetsu Hozuki, genjei falls under the broad category of Dark Side Release, and as such, is mostly associated with the Sith and rogue Jedi, avid users of the dark side of the Force.

Source

 * https://naruto.fandom.com/wiki/Genjutsu.