In HTML, the element is used to define a container at the top of a document or section that typically contains introductory or navigational information. It is often used to include logos, site titles, menus, or any other content that appears at the beginning or top of a page.
On the other hand, the element is a heading tag used to define the main heading of a section or document. The tag represents the highest level of heading, and subsequent heading levels are denoted by , , , and so on.
In summary, the key difference is that is a container element used to include introductory or navigational content, while is a specific element used to define the main heading of a section. However, it is common to use within the element to provide the main heading of a page.