The HTML tags <h1> to <h1> are used for specifying the different level of headings.
There are 6 levels of headings (<h1> - <h6>) with <h1> the most important and <h6> the least important.
Browsers typically render the various headings in different sizes.
<h1>The main heading</h1> <h2>A subheading</h2> <p>the paragraph</p> <h2>Another subheading</h2>