An aura is a special feeling or quality that seems to surround a person, place, or thing; in medicine, it can be a warning feeling some people get before a migraine or seizure.
It comes from Greek *aura*, meaning 'breeze' or 'breath of air'. The word shifted from a literal breeze to a more invisible, surrounding presence.
The 'breeze' idea fits our sense that some people seem to carry a mood or energy around them. Whether or not you believe in mystical auras, psychologists know that facial expressions, posture, and tone really do create a kind of emotional climate around you.
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