Fire Release (火遁, Katon) is one of the nature transformations. It gives the user the ability to produce fire by moulding superheated chakra inside the stomach before releasing it via the lungs and mouth. It is weak against water, but strong against wind.
Pseudo-Fire Release (火遁もどき, Katonmodoki) is one of the pseudo-nature transformations of Rock Lee's. Lee uses his own element to create his own fire by using matches. This is also a part of his pseudo-ninjutsu.