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Katon (Fire Release) are offensive-type techniques that allow the user to to manipulate their fire chakra-nature to create fire by super heating their chakra and releasing it from their mouths.

Fire Ninjutsu is common among Konohagakure ninja, with the Uchiha Clan being particularly proficient with its use.

Fire is strong against Wind; because wind naturally feeds fire. When used together, the wind augmented fire jutsu can be strong enough to evaporate its natural weakness of Water.

Fire-natured chakra is a component in an Advanced Nature Transformation with earth-natured chakra, creating Lava Release, the unique chakra type of the Four-Tailed Monkey Bijuu (Yonbi no Sabu).

It seems there is an advanced version of Katon called Enton (Blaze Release), which makes use of the black flames created by Amaterasu.