Dear Student
Simple bulb is incandescent bulb only.
The incandescent light bulb or lamp is a source of electric light that works by incandescence, which is the emission of light caused by heating the filament.
Other one is the fluorescent bulbs. In a fluorescent tube, the electric current passes between the cathodes, exciting mercury and other gasses which are filled inside, radiating energy. The phosphorous coating at the outside converts radiant energy into visible light. The fluorescent lamps use less energy to produce the same amount of light and can last longer.
Regards