what is doctype in html code example

Example 1: doctype html

<!DOCTYPE html>
This tag shows that it is running HTML5

Example 2: doctype tag

<!DOCTYPE html>  <!--This doesn't have closing tag like others-->
this means this is the version 5 of HTML or HTML5

Example 3:

<!DOCTYPE html>

Example 4: doctype html

<!DOCTYPE html>
it lets the browser know about the version of HTML you
are using.but it is not nessesary 
since your browser will render it anyways

Example 5: how to declare document as html

<!DOCTYPE>
<html>
	<head>
      	<meata  bla bla>
     </head>
      <body>
        	<p>hfkjhdskjfhkdjhfjdhkfhd</p>
       		 <p>hkjdfhjdhfjhdjhfhdjfhdkj</p>
      </body>
</html>

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Html Example