Which HTML tag is used for the main heading on a website?

The main heading on a website is represented by the tag commonly known as <h1>. This tag is specifically designated for the highest level of headings, indicating the primary topic or key focus of the webpage. It plays a crucial role in structuring content, making it easily understandable for both users and search engines. Using <h1> tags correctly enhances SEO by signaling to search engines what the main theme of the page is, thus aiding in better search visibility.

Other options, such as <section>, <header>, and <title>, serve different purposes in an HTML document. The <section> tag is used to define a section of content, the <header> tag is meant for introductory content or navigational links and can encompass multiple headings, and the <title> tag defines the title that appears in the browser tab, not a visible heading on the webpage. Each of these tags contributes to the overall structure and semantics of a webpage but does not serve the specific function of presenting the primary heading in the same way as an <h1> tag.