Basics
Mods have in Luanti a multiple meaning. Luanti itself is working with mods. A game runninng in Luanti consists of several mods. And the funcitonality of a game can be extended with additional mods.
To be used, a Mod has to be activated in the world.mt of the game world used. Add simply a line with
load_mod_<name of the mod> = true
and start the game. The mod will now be loaded automatically.