An H2 is a secondary heading on a webpage that breaks the content into major sections under the main H1 title. In HTML, it is marked up with the h2 tag and is commonly used for the primary subtopics within a page.
For SEO and usability, H2s help create structure. They make a page easier to scan, improve readability, and help search engines understand how the content is organized. Well written H2s can also reinforce topical relevance by clearly signaling what each section covers, especially when they align with related subtopics and common user questions.
A good approach is to use H2s for the main themes you want the page to cover, then use deeper headings like H3s when you need to break those sections down further. Focus on clarity first, and avoid forcing keywords into H2s in a way that feels unnatural.