HTML Heading tags can be used to define as a title or a subtitle which you want to display on your page. When you place the text in the heading tags <h1> This is your page title</h1>, These heading tags displayed on the browser in the bold format and size of the text depends on the number of heading.

There are six different HTML headings which are defined with the <h1> to <h6> tags. h1 is the largest heading tag, and h6 is the smallest one. So h1 is used for most important heading, and h6 is used for least important.

BY Best Interview Question ON 27 Jan 2019