Mods
What is a mod?
Mods (short for modifications) are user-created modifications to the game in such a way that alters gameplay. Some larger mods may add a lot of content to the game, while other smaller mods may add more settings/customization options, or optimize the speed, gameplay or graphics of Minetest. Server mods or plugins mainly give server admins more options and ease of use, and all mods for single-player can also be used in multiplayer.
While Minetest mods are generally safe to install, one should exercise caution with mods to prevent crashes, system instability, deletion of game/save data, or potential malware infections from a bad link or the mod itself. A good way to protect your game from such problems is to back up your Minetest folder if you choose to use mods. There are many mods or plugins available to complement the original Minetest game or give server admins more options and control over their servers.
Installation
See Installing Mods.
Finding Mods
Mods can be currently be found in several places:
Creating Mods
Mods are created in Lua, a relativiely simple scripting/programming language. The Lua API documentation can be viewed here.
Also take a look at our Development Wiki.