The tag that marks a heading in HTML is often used to help Google index your webpage, as well as help with SEO.
Learn how to use heading tags to create a hierarchical structure for your page
A heading is the title of an article. It gives an overview of the article. An example of a heading is the few words you can see at the top of this page that describe the subject of this post.
How great your page titles are for SEO
This article includes three to four paragraphs, with headings and subheadings for clarification.
Headings help us to find information in PDFs quickly and easily. Headings also provide context in a document. They allow people with disabilities, who use screen readers, to find portions of the text.