BdLib Mod API [1.18.2, 1.16.5] for Minecraft includes a code set and a general API that are necessary for other mods to run, according to the author.
A supporting mod, BdLib will not have any effect when installing independently in Minecraft, it will support to run for other mods. The mods that BdLib supports usually use a general code set in structure. Therefore, it can reduce the file size and save time as well as optimize the system. That is why the author puts this code set into BdLib.
Few mods that require this API to run:
Gendustry
Pressure Pipes
Advanced Generators
AE2 Stuff
Compacter
How to Install BdLib Mod [1.18.2, 1.16.5] for Minecraft