H1 and H2 are heading formats or syles. H1 heading is used for article title and should appear only once in a single article. H2 comes second after h1. Unlike h1, h2 can be used more than once in an article.
Headings are important in content structuring.
Headings are also important in SEO as they help Search Engines understand how your content is structured. Content structure plays a crucial role in search engine ranking.