Your six bodies are a key to maintaining a true, holistic, conscious homeostasis within yourself. 

• Physical - you are acquainted with this body.
• Mental - In charge of problem-solving and mental emotions (anxiety, worry)
• Emotional - In charge of energy systems and processing stuck energy and emotional mind (memories etc)
• Hermetic body - Big brother of the Mental - in charge of higher functions of the mental body such as observation of self, self-awareness
• Elemental body - Big sister of the Emotional - home of the wild child, highly receptive nature being. In charge of magic, manifestation and dark processing. 
• Etheric Body - aka Karmic matrix, the structure that knits all the other bodies together so that karmic backlogs are burnt and progress us through the perception of linear time.