In general, a filler is something that is used to fill gaps. Specialist meanings of the word "filler" include:

• In linguistics, fillers are sounds that are spoken to fill up gaps in utterances.
• In materials, fillers are particles added to a matrix material, usually to improve its properties.
• In music, filler notes are added between beats.
• In media, filler refers to material that exists to pad out other material.
• Filler (song) Also a song by the Hardcore Punk band Minor Threat.
• Fillér was one hundredth of a hungarian forint, but is not in use anymore.

• Fillers for the industry

Fillers are mostly used in furniture industries to fill the plywood or wooden surfaces prelaminated or laminated, prepolished or polished and on all sorts of woods so that no absorbing pores/minute holes are left open. This is done prior to the application of wood polishes\finishes and wood stains so as to maintain a better look of such surfaces.