(Trāṭaka): “To gaze steadily,” a yogic practice of concentrating the mind and diminishing its oscillating tendencies. Trataka is one of the shatkarmas (six traditional yogic purification practices) and is of two kinds: Bahir (bahiranga) trataka or “external trataka,” (concentration on an external object by gazing steadily, without blinking) and Antar (antaranga) trataka or “internal trataka,” (concentration on an internal object while the eyes are closed and the mind concentrates on some subtle element within). The purpose of focusing the eyes on an external object is to arouse the internal vision, making it absolutely steady by stopping the movements of the eyes.