fire(aka katon) is one of the basic 5 elements in narutoverse.It ih mostly formed by concentrating fire chakra in the body and blowing it out through the mouth.It is weak to water but strong to wind(as wind fuels fire)
Also quenching very hot fire with water produces steam
okay... i sit down in a budha stance and begin meditating...i close my eyes and take in deep breaths and concentrate on the universe, and allowing my chakra to flow through my body in perfect unity with the environment
Ookae.....still with my eyes clolsed, i focus on gathering the chakra in my stomach so it can be molded into heat.i succeed in doing this while still taking in deep breaths to build up the heat....i then perform the 'Tiger' handseal.......