Document type declaration otherwise known as Doctype is an instruction used by web browsers to fetch what version of HTML the website is written in.
For understanding, it helps browsers how the document should be interpreted thus eases the rendering process. It is neither a tag nor an element.
The top of the document was the Doctype should be placed.
It does not need a closing tag and does not contain any content.

Syntax:

<!DOCTYPE html>

For example,

<!DOCTYPE html>
<html>
<body>
     <h1>Welcome to Kaashiv Infotech</h1>
     <h2>This is HTML5 Doctype Tag</h2>
</body>
</html>

Output

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