What is a bone hierarchy

Hello folks, i 'm trying to implement a cars system for my game. so i bought an asset for the game engine i’m using that does this. But for implementing my own cars meshes i need to recreate the same bones hierarchy as the asset is using. the thing is i don’t know what a bone hierarchy is. here’s the asset mesh in Blender

A bone hierarchy is the way that bones are parented. If you need to recreate it, you need to have bones with the same names and the same parents as what you’re recreating.