Pose Mode is a an editing mode specific to the armature object type, used for positioning, or 'posing' the bones in an armature. This tag should be used for questions about editing armatures in Pose Mode.

Blender has different tools available for manipulating objects in the 3D Viewport editor, depending on what mode the object is in. One of these is Pose mode. The manual describes object mode as

An armature only mode, dedicated to armature posing.

This tag should be used for questions that are specifically about the operations that can be performed on an armature when it is in pose mode.