<h2> is an HTML tag used to define the second level heading in a web page, which plays a crucial role in organizing content and improving readability. This tag is part of the heading hierarchy in HTML, ranging from <h1> to <h6>, where <h1> is the highest level and typically used for main titles. Using <h2> appropriately helps create a clear structure in web documents, enhances SEO (Search Engine Optimization), and aids accessibility for screen readers.
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