What's fire made of?

The symptom of an exothermic reaction out of control. It needs O2, fuel, and a spark to start and to keep going.

Gas atoms, some molecules and very small particles emitting light, due to fluorescence and thermal emission. All fire isn't red. A natural gas flame (CH4, methane) will burn blue in the right environment.

A fire means a release of heat and light accompanied by flames as a result of some chemical changes.

Oz,Heat,Fuel.

Fire is not a state of matter: rather, it is an exothermic chemical reaction accompanied by intense heat released during a rapid oxidation of combustible material. Fire may be visible as the brilliant glow and flames and may produce smoke.

fire is intense heat & light, some ionized atoms and molecules too. The energy is released by chemical reaction is utilized to excite and de-excite atoms and molecules. the emmited light is thus dependent on the temperature and nature of substance being burnt.

Oxygen, heat, fuel.

Oxygen,fuel and heat. That is what makes the color and everything.

They are just luminescent gases. Something as high energy as combustion pushes electrons into an excited state (an orbital higher than their ground state). When the electrons decay, they give off that energy as light which is visible to your eye. It is not completely unlike glow sticks. With them, the excitation of the electrons occurs through a chemical reaction with a much lower thermal barrier than combustion.