Architectury API is a library that is required for some mods to work. It makes it easy for developers to create mods for multiple loaders at once. You only need to download this library if it is required for the mod to work. You can find Architectury API not only for Fabric but also for Forge.
How to install Architectury API mod
- Make sure you have installed Fabric Mod Loader and Fabric API.
- Download the mod for your version of the game.
- Put it in the ‘mods’ folder, which is located in the game folder.