A diagram displaying equal margins of width 25mm on an A4 page.
In typography, a margin is the area between the main content of a page and the page edges. The margin helps to define where a line of text begins and ends. When a page is justified the text is spread out to be flush with the left and right margins. When two pages of content are combined next to each other (known as a two-page spread), the space between the two pages is known as the gutter. The top and bottom margins of a page are also called "head" and "foot", respectively.
The default margins for Microsoft Word from version 2007 onward have been 1 inch (2.54 cm) all around; until Word 2003, the top and bottom margins were 1 inch (2.54 cm), but 1.25 inches (3.17 cm) were given at the left and the right.OpenOffice Writer has 0.79 inch (2 cm) all around.LaTeX varies the width of its margins depending on the document size and font size used but it tries to adjust the margins for optimum readability (approximately 66 characters per line) which sometimes results in fairly large margins.