The user compresses a large amount of chakra built up inside their body and changes it into a dragon head-shaped fireball. The user then skillfully manipulates that great fire, and attacks their opponent. Even outside of the attack range, its power and reliability are stressed.
The flames have a high temperature, which can create an upward movement of air currents which in turn can give rise to thunder clouds. A master of this technique can fire off several flames in succession and anyone caught in the technique could potentially be reduced to ashes.
This technique is a part of the setup that Sasuke uses in order to perform his Kirin technique.