Moonlight Lib Mod for Minecraft 1.19.3, 1.19.2, 1.19.1 and 1.19, is a complement necessary to be able to run some Minecraft mods, usually from the same creator. That is to say, in case you do not have it installed, certain mods will not be able to be executed in any way.
As usual in this type of cases, Moonlight Lib will not have any kind of utility on its own, so it will need at least one other mod to be functional. It is actually a complement required by mod developers in order to make certain features work.
The installation of this add-on is really simple, and in fact, it will only be necessary to place Moonligh Lib in the “mods” folder, inside the game location. Despite the ease of installation, this folder may not be present by default, so it will sometimes be necessary to create it.
Normally, Moonlight Lib is used to make certain features related to some mods of the same creator work, that is to say, it is a complement necessary for the correct execution of certain mods.