Word allows you to apply borders to parts of your document. Or, using the Page Setup dialog box, you can apply a border to your entire document:
1. Click File and select Page Setup
2. In the Page Setup dialog box, open the Layout tab
3. Click the Borders button
4. In the Setting section, you can specify a pre-defined format
5. Or, You can select a style, color and width for your border
6. Then, in the Preview section, click around the areas of the document where you would like the borders to appear
7. Once you have made your choices, click OK
When youre done, Word will apply the borders to your document.

