Page margins are the blank space around the edges of the page. There is a 1 inch (2.54 cm) page margin at the top and bottom of the page, and a 1.25 inch (3.175 cm) margin on the left and right sides of the page.
These margins will probably be fine for most of the documents you create. But if you want to create a document with different margins, you should know how to change them. When you type a very brief letter, for example, or if you type a recipe, an invitation, or a poem, you might like to set different margins.
For example, you could change the top and bottom margin to 2 or 3 inches (5.08 or 7.62 cm), and the left and right margins to 2 inches (5.08 cm).
Or, if you have a resume that you want to keep on one page, you might change the top and bottom margins to 0.5 inch (1.27 cm) and the left and right margins to 0.75 inch (1.905 cm) to fit more information on the page.
To change margins, you click Page Setup on the File menu, and then click the Margins tab. Then you enter different settings in the Top, Bottom, Left, and Right boxes, as appropriate. You'll see how in the practice.