A theme is a set of design elements and colors that you can apply to give your Web pages a professional look. Applying themes helps keep your pages visually consistent, as well as visually appealing.
When you apply a theme, all your headings, body text, colors, bullets, and so on will be automatically styled according to the theme. Themes also can include background images. You have the option of applying a theme to one page, to many pages, or to your entire Web site.
Themes do not define things like the location of navigation bars or the layout of your page. Instead, themes simply alter the appearance of color, fonts, and certain images on your pages, as shown in Figure 3.4.