The Fire Materia is an enemy in Crisis Core -Final Fantasy VII-. Sephiroth summons it, along with the Thunder Materia and Blizzard Materia, to defend himself and to attack Zack with the magic that they represent. The elemental Materia cast spells based on their element up to -ga level, and resist the element they are composed of as well as physical attacks.
Fire is the rapid oxidation of a material in the exothermic chemical process of combustion, releasing heat, light, and various reaction products.
Materia means "matter" or "substance" in Latin, Spanish and Italian; it also means "subject" in Italian and Spanish, and is the ascendant of Portuguese "Matéria".