Filament.
Correct; made of tungsten wire in most incandescent bulbs.
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As the name implies, support wires support the filament wire in the bulb, The filament, of course is the wire that glows white hot, giving out light
In an incandescent light bulb the wire that gives off the light is called the Filament.
In most home wiring circuits, the black wire is used to power a light bulb. The other wire is white and is called the neutral conductor.
You are thinking of a filament.
battery, wire, and light bulb