Headings represent header tags used to structure a text in order to guide people and search engines through the page and to increase the accessibility of a page.
Headings are also called header tags, and they help people and search engines understand a text easily by guiding them through the article or content.
Header tags help structure the text, as they are very informative and indicate what a section or paragraph is about. This is a very easy and simple way to make the content more accessible and easier to read by visitors, and by crawlers that index the pages for search engines as well.
Most CMSs offer multiple heading levels, usually starting from Heading 1 (H1), up to Heading 6 (H6), with H1 representing the most important information - such as the title - and will be the biggest as well. As the heading number goes up, the importance and the text size will decrease.