These are the tags that are used to provide the page headings that describe the page and are considered by search engines to determine the relevance of the web page.typically keyword- rich, which is used for headings and subheadings.
<h1> defines the most important tag for heading purpose.if u want to use h1 tag in HTML PAGE than comment like this <!--<h1>Website Design</h1>-->.finally h1 to h3 tags are most important tags from the seo point of view!