The Heading module inserts a heading or title into your row.
The advantage of using the Heading module instead of just marking up a heading in the Text Editor module is that you can easily customize the style (font family, color, and size) and layout (margins).
You can also specify the heading size (H1, H2, and so on.) By default, the heading font family and size are set by your theme, but you can override the default on the Style tab.