In which state of matter does fire exist?

Fire exists in the state of matter known as plasma. Plasma is often referred to as the fourth state of matter, in addition to solid, liquid, and gas. In a fire, the substance being burned undergoes a chemical reaction called combustion, which produces heat and light. The high temperatures involved cause the atoms and molecules of the burning material to become ionized, resulting in the formation of a plasma. Plasma is a state of matter in which the atoms or molecules are stripped of their electrons, leading to the presence of positively charged ions and negatively charged electrons. Fire typically appears as a luminous, glowing plasma due to the excitation and emission of light by the energized particles within it.