Ambient	feeding is using energy that is thrown off of people in group situations such as malls, clubs, etc.
Astral	feeding is done while traveling in the astral realms, and drains the energy from the individual's soul as it is linked to the astral plane.
Auric	feeding is similar to ambient feeding except it focuses on an individuals outer energy level commonly referred to as the Aura.
Core/Chakra	feeding is using energy from an individuals core, deep within their body.  These sources are sometimes referred to as chakras.
Emotional	feeding is the use of energy released by emotional outbursts.