Semantic markup refers to the use of HTML tags that convey meaning about the content they enclose. Unlike traditional markup, which focuses on how content looks, semantic markup emphasizes the structure and purpose of the content. For example, using tags like <header>, <article>, and <footer> helps search engines and assistive technologies understand the role of each section in a webpage. By employing semantic markup, web developers enhance accessibility and improve search engine optimization (SEO). This practice allows search engines to better index content, making it easier for users to find relevant information. Overall, semantic markup contributes to a more organized and meaningful web experience.