what does hr mean html code example

Example 1: which is right or in html

<hr> <!--   it represents a horizontal line break, in HTML4.0 we use <hr>, 
            in XHTML1.0 we use <hr/>,  in HTML5(which is the current version of 
            HTML) we can use both <hr> and <hr/>    
       -->

Example 2: what does in html mean

<p>HTML is a language for describing web pages.....</p>

<!--the hr tag stands for horizontal rule and will make a line across your page at that point-->
 <hr>

 <p>CSS defines how to display HTML elements.....</p>

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