Page margins are the blank spaces around the edges of the page. There is a 1-inch (2.54 cm) page margin at the top, bottom, left, and right sides of the page. This is the most common margin width, which you might use for most of your documents.
But if you want different margins, you should know how to change them, which you can at any time. When you type a very brief letter, for example, or a recipe, an invitation, or a poem, you might like different margins.
You also use the ribbon to change margins, except you work from the Page Layout tab. First you click it to select it, and then, in the Page Setup group, you click Margins. You'll see different margin sizes, shown in little pictures (icons), along with the measurements for each of the margins.
The first margin in the list is Normal, the current margin. To get narrower margins, you would click Narrow. If you want the left and right margins to be much wider, click Wide. When you click the margin type that you want, your entire document automatically changes to the margin type you selected.
When you choose a margin, the icon for the margin you chose gets a different color background. If you click the Margins button again, that background color tells you which margin size has been set for your document.