Which tag is used to define the main content section of an HTML document?

The tag that defines the main content section of an HTML document is the

tag. This element is used to encapsulate the dominant content on a webpage, which is essential for both organizing content and enhancing accessibility. By using the

tag, developers can create a semantic structure that helps search engines and assistive technologies, such as screen readers, better understand the primary content of the page.

The

tag is specifically designed to highlight the core content, distinguishing it from other elements like

and

, which serve different purposes. While the

tag typically contains introductory content or navigational links at the top of the page, and the

tag contains information about the document, including copyright and contact details at the bottom, the

tag uniquely identifies the main portion of the document that is directly related to the central theme or purpose of the webpage. This makes it a crucial component for building modern, semantic HTML documents that enhance both usability and SEO.