Heading Tag 1. The <h1> <h2> <h3> <h4> <h5> <h6 > tags are used to define HTML headings. 2. Defines the most important heading and important for SEO. 3. Defines the least important heading. EXAMPLE <h1> This is h1 heading tag</h1> <h2> This is h2 heading tag</h2> <h3> This is h3 heading tag</h3> <h4> This is h4 heading tag</h4> <h5> This is h5 heading tag</h5> <h6> This is h6 heading tag</h6> OUTPUT This is h1 heading tag This is h2 heading tag This is h3 heading tag This is h4 heading tag This is h5 heading tag This is h6 heading tag NOTE: tag is the biggest heading while is the smallest heading tag.