Fabric API Mod 1.16.5/1.15.2/1.14.4 is known as a core library reserved for the most common hooks and incompatibility measures. These are items deployed by mods using the Fabric toolchain.
About Fabric API
Fabric is a lightweight and experimental modding toolchain for the game. Its aim is snapshots and releases. It’s obtainable for all.
Fabric’s APIs are also lightweight and modular. They help porting become quicker and make MC instances thinner.
Fabric API a separate API and Library edition from the Fabric loader. You should have both for most mods. Besides, remember that the project will ask you to download and install the Fabric mod loader!
How to install Fabric API Mod:
Assure that you have already installed Minecraft Forge
Define the location of the Minecraft application folder.
On the windows, open Run from the Start Menu, write %appdata% and click to Run
Open Mac on the finder, press and hold Alt and click to Library on the peak of the Menu Bar. Open the Application Support directory and look for Minecraft.
Put Fabric API Mod you have already downloaded (.jar) into Mods directory.
When you start using Minecraft, open the mod button, you will realize that Fabric API Mod has been set up.