In typesetting or editing, when used as verb, insert means to add material to a body of text. When used as a noun, it means the material that has been added.
In binding and finishing, an insert is one printed signature which has had another signature wrapped around it. See Inserting.
The term insert also refers to any pre-printed page or set of pages which are placed into a separately-printed publication. Examples of inserts are advertising supplements, maps, or foldouts. A free-standing insert is a single signature added to a newspaper.