This is a special library that provides mods for Minecraft with necessary functions and capabilities for their operation.

It is mandatory when installing the Fabric add-on. Fabric itself is a special tool on which many Minecraft mods operate. Typically, when you download a mod, you'll see a corresponding library link alongside it that's required for its operation. Usually, it's either Fabric or Forge.

Installation instructions:

• Download and install Fabric (if not already installed).
• Download this mod from the link below. There you'll find the Fabric API mod for various versions of Minecraft.
• Unpack the mod archive and copy its contents into the .minecraft\mods folder.
• Done.