This is a tag that serves as a logical divider of the text into parts and as a text heading. Header tags are used by the program to make a TOC. There are six header tags are defined in HTML, ranged by importance. It is defined as
The header tags are used for section headings. They are usually rendered in large, bold letters and placed on its own line. H1 is the largest and H6 is the smallest.
a "block level" tag, which means the browser automatically places spaces above and below it