HTML provides six different levels of heading tags, from h1 to h6, which are used to define the hierarchy of content on a web page.

The reason why there are only six heading tags in HTML is that they cover a wide range of needs for structuring content. Typically, web pages do not require more than six levels of headings, as this can make the page structure overly complicated and difficult to navigate for users.

Moreover, having too many levels of heading tags would also lead to confusion among web developers about which heading level to use, which could result in inconsistent and less accessible web content.

It is important to note that the use of heading tags is not limited to just formatting text as a heading, but they also help search engines understand the content of the page and assist in improving accessibility. Headings help screen readers to navigate through a web page, making it easier for visually impaired users to access the content. Additionally, headings also help search engines understand the structure and hierarchy of the content, which can improve the page’s ranking and visibility in search results.