In typography, a margin is the space that surrounds the content of a page. 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.
Commonly-used margins in word processing software are 25 mm for A4 paper and 1 inch for North American letter paper.
See also
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