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A filament is a thin, flexible wire or thread of a material that is used in a variety of applications, including in light bulbs, 3D printing, and welding. In a light bulb, the filament is heated by an electrical current, causing it to emit light. In 3D printing, the filament is melted and extruded through a nozzle to create a three-dimensional object layer by layer. In welding, a metal filament is used to join two pieces of metal together by melting the filament and allowing it to cool and solidify, creating a bond between the two pieces.
Filaments can be made from a variety of materials, including metals, plastics, and fibers, depending on their intended use.