The <hr> is short form for horizontal rule. This tag is used to paragraph-level thematic break or line to separate document or sections in HTML document.
It is used when you want to change your topic in your HTML document. There is no need to close this tag as it is an optional tag.
<p>HTML is a Hypertext Markup Language. </p>
<h2>HR Tag </h2>
<p>HR tag is used to draw a horizontal line within the texts to sepate content.<p>