List and define different types of heading tags.

HTML has six levels of headings, numbered 1 through 6, with 1 being the largest. Headings are typically displayed in larger and bolder fonts than normal body text.

The heading tags are as follows:

1. <H1>
2. <H2>
3. <H3>
4. <H4>
5. <H5>
6. <H6>

The first heading in a document is tagged <H1>, the second heading is tagged as <H2> and so on.