When designing new web pages you can use Heading Tags to label your headlines. These tags are used to differentiate the headings of a page from the rest of your content. These are often referred to as HTML header tags, and/or SEO header tags. Search engines still consider the contents of these tags as important, especially the H1 tag, which is the first-level heading tag. While the H1 tag is the most important, the least important is the H6 tag. In HTML coding the heading tags from h1 to h6 form a top-down hierarchy.
The heading tag is used to represent different sections of web page content. It has an impact on both the Search Engine Optimization (SEO) and usability of your site. Search engines use your headings to index the structure and content of your web pages. As you probably do yourself, most users will simply skim your pages by their headings. It is important to use headings to show the document structure.