A HTML heading or HTML h tag can be defined as a title or a subtitle which you want to display on the webpage. When you place the text within the heading tags <h1>.........</h1>, it is 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.
See this example:Test it Now
Heading no. 1
Heading no. 2
Heading no. 3
Heading no. 4
Heading no. 5
Heading no. 6
Heading elements (h1....h6) should be used for headings only. They should not be used just to make text bold or big.