Fly ash is a byproduct of coal combustion in power plants and is composed of fine particles that are carried up with flue gases. It is collected from the flue gases using electrostatic precipitators or baghouses. Fly ash has various applications, such as in cement production, as a filler material in roads and construction, and in the manufacturing of concrete products. Due to its composition and properties, fly ash is considered a sustainable alternative to traditional construction materials and can help reduce the environmental impact of coal-fired power plants by recycling this waste material.