(The N in this name is pronounced like 'n' in 'on'. )
Agni is the fire God in Indian mythology. One of Daksha's daughters Svaahaa is his wife. Shiva's son Kumaara or skanda is treated as Agni's son too. Puraanams say that Agni originates from water itself and thereby it cannot win against water ie its source. Agni is also considered to be an outcome of Prajaapathi's anger.
Agni is one of the five elements ( the other four are - Water, Earth, Air and Sky ). He is also the lord of the South-East direction ( There is one Lord for each of the directions.They are, in the order from east to north-east - Indra,Agni,Yama,Nirithi,Varuna,Vaayu,Kubera and Eeshaana) .He is the principal deity for the daily rituals of vedic culture. He is the carrier of the propitiating sacrifices offered to the Gods. Agni is the ultimate purifier of things and the worthiest witness of actions performed by humans. Hence all solemn undertakings are pronounced in the presence of Agni ( marriage-for example ).
Agni appears at many places in Mahaabhaaratham as well as in many Puraanams. A Puraanam among the eighteen principal ones is named after Agni as Agnimahaapuraanam.
Agni requested Arjuna and Krishna to help him consume the Khaanadavaprastha forest . As instruments to aid them in that task, he awarded the great bow Gaandeevam with two ever-full quivers and a divine chariot to Arjuna and the unfailing discus to Krishna. After the war was over, Agni himself burnt down the chariot with horses. Agni again appeared before Arjuna during their renunciation walk to tell him to throw the Gaandeevam into the sea, i.e. to reach its donor Varuna.