textwidth
Textwidth is a typographic term that describes the horizontal extent of the main body of text on a page or in a column. It represents the width available for lines of ordinary text, excluding margins, headers, footnotes, and other marginal material. The measure is important for determining line length and page balance.
In TeX and LaTeX, textwidth is a specific length that defines the width of the text area
Adjusting textwidth is commonly done via page layout tools such as the geometry package in LaTeX, or
Outside of TeX, the concept appears in other typesetting and web contexts as the width of a