Sometimes a new paragraph is not needed but text needs to drop to the next line. The break tag <br /> is one of the exceptions to the pair-of-tags rule. Only one tag is needed in order to insert a break. The slash within the tag indicates that the tag is not affecting content within its tags, but rather is only open and shut. Simply put the tag where the break needs to be.
<p> This is <br /> a paragraph with <br /> line breaks </p>