Semantic HTML is essential for building web pages that are accessible, search-engine friendly, and easy to maintain. When you use semantic elements like header, nav, main, article, and footer, you give meaning to the structure of your content.

This helps screen readers and assistive technologies understand your page, making it more accessible for users with disabilities.

Semantic HTML also helps search engines interpret your content, which can improve your site's visibility in search results.

Finally, semantic markup makes your code easier to read and maintain, both for yourself and for other developers who may work on your project in the future.