Use <hr/> to create a horizontal line. This tag is similar to line break.
<hr/> Use <hr/><hr/> With <hr/> Caution <hr/>
The horizontal line can be useful in different circumstances, like you can see in the next example : a footnote.
<hr /> <p>1. "The Hobbit", JRR Tolkein.<br /> 2. "The Fellowship of the Ring" JRR Tolkein.</p>
1. “The Hobbit”, JRR Tolkein.
2. “The Fellowship of the Ring” JRR Tolkein.
As you can see, everything that this tag does is to draw a horizontal line separating different parts of the content or it just decorates the page. Use it with skill and it will produce unexpected results.