The term Agni means which moves forward. In the context of living organism it is the one which maintains integrity and performs vital activities by converting anna and dhaatu continuously to move Ayu (life) forward. Pitta is same as Agni (Pittameva agniriti) or Agni not found in any other component other than Pitta (Na Pitta vyatirekaad anyo agnihi). They have similar functions.
