The Fire Release (火遁, Katon; English TV "Fire Style") area of elemental nature transformation are 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.
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 jutsu can be strong enough to overwhelm its natural weakness of water.