Difference between bpy.data.objects['Armature'] and bpy.data.armatures['Armature']

Question

Can someone please explain me what is the difference between:

bpy.data.objects['Armature']
bpy.data.armatures['Armature']

I can see they have different types and properties:

>>> type(bpy.data.objects['Armature'])
<class 'bpy_types.Object'>

>>> type(bpy.data.armatures['Armature'])
<class 'bpy.types.Armature'>

bpy.data.objects['Armature'].pose is a valid object but bpy.data.armatures['Armature'].pose returns an error, why?

I also noticed bpy.data.objects['Armature'].data returns bpy.data.armatures['Armature']

What is their respective definition and for which purpose shall one be used vs the other?

armature objects python

HikariTW · Answer

Document here
bpy_types.Object is a container wrapper for inner data to communicate with Blender Scene and other stuff.
You can rename your bone and armature:

>>> C.object
bpy.data.objects['Obj Armature']

>>> C.object.data
bpy.data.armatures['Real Armature']

And with the tree display in outliner, that should be clear that Object has Pose properties and the armature itself doesn't.

Difference between bpy.data.objects['Armature'] and bpy.data.armatures['Armature']

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