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Fire Release (火遁, Katon; English TV "Fire Style") is one of the basic elemental nature transformation offensive-type techniques that primarily allow the user to create fire by increasing the temperature of their chakra. There are some exceptions to this though in which the shinobi forms mediums in order to create explosions.
Commonly affiliated with the Tiger hand seal, Fire Release techniques are mid-to-long-ranged that cause burning and explosive damage. Fire ninjutsu is common among Konohagakure ninja, with the Uchiha clan being especially proficient with its use. Amaterasu, a Mangekyō Sharingan technique that ignites a target with powerful black flames, is known as the highest level fire technique. Amaterasu has been seen to be near unquenchable; only Sasuke Uchiha has been seen to be able to suppress them.
Fire Release is strong against wind because air naturally feeds fire but weak against water due to its ability to extinguish flames. A sufficiently powerful fire technique can overcome its natural weakness of water by evaporating it.
Fire Release is also effective when used in conjunction with Wind Release, as the power of the flames is greatly increased. Fire Release techniques can also produce thunderclouds when shot into the sky, producing the conditions necessary for a Lightning Release technique utilising natural lightning.
- Fire-natured chakra is also a component of two different kekkei genkai, namely: Lava Release (when combined with earth) and Boil Release (when combined with water); and the kekkei tōta Dust Release, when combined with earth and wind. In addition, Fire Release possesses an advanced variant known as Blaze Release, which is seemingly used through the manipulation of the black flames of Amaterasu.
- Fire Release parallels the real-life ninja art "katon-no-jutsu". One example of real-life katon-no-jutsu is Hitsuke: the practice of distracting guards by starting a fire away from the ninja's planned point of entry.