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.
• Also in music, but more to do with albums, a Filler Track is a track that is deemed not to be a major, standout song, but one to 'fill' the void between two other songs, acting like a link, or to simply get the album up to a reasonable number of total songs.
• 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.
• In media, filler refers to material that exists to pad out other material. This is often done in anime-adaptation of a running manga, which allows the manga artist create enough buffer to prevent an alternate plot (as in Trigun, Hellsing)
• 'Filler' is also a term commonly applied to short pieces of information used to 'fill' odd gaps on the printed page of a newspaper or other publication when the main feature falls short of the full page. And so we find mini-articles, jokes, cartoons, recipes, poems, usually submitted by freelance writers being used, and often paid for, to 'fill' these blank spaces.

• 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 polishesfinishes and wood stains so as to maintain a better look of such surfaces.

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