In general, a filler is something that is used to fill gaps. Specialized meanings include:
Materials Filler (animal food), dietary fiber and other ingredients added to pet foods to provide bulk Filler (materials), particles added to a matrix material, usually to improve its properties Filler (packaging), a machine designed to fill packaging, usually occurs in food packaging Filler metal, metal added in the making of a joint through welding, brazing, or soldering Grain filler, a product that is used to achieve a smooth-textured wood finish Injectable filler, a soft tissue filler injected into the skin to help fill in facial wrinkles Star filler, a plastic insert in computer cables which separates wires
Media and entertainment Filler (media), in television and other media, material that exists outside the story arc to pad out other material "Filler", song by hardcore punk band Minor Threat, from their debut E.P.
Other uses Filler (linguistics), a sound spoken to fill up gaps in utterances Placeholder word Filler (surname) Seat filler, a person who fills an empty seat during an event
See also fillér, name of various small change coins throughout Hungarian history, and one hundredth of a Hungarian forint Filer (disambiguation) Placeholder (disambiguation)