HTML(Hypertext Markup Language) Headings

Headings are defined with the <h1> to <h6> tags.
This heading (<h1> ) means the most important heading.

and  <h6> means the least important heading.

As for example:

<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6>