These are game modifications that provide new capabilities and features.
For example, thanks to the mods you can:
Build a machine for the automatic extraction of raw materials as well as the creation of other structures in the pump, an automatic machine for digging, pipes, etc. Mod adds the possibility of suspicion of all possible crafting recipes available Minecrfacie. Mod adds minimap so that we can set waypoints. Etc.More can be found on the blog How to mod Minecraft.