Coding element used in HTML or XML languages to structure and interpret the contents of a web page (titles, paragraphs, images, links...). Tags are also essential for SEO, by defining content hierarchies (e.g.:<h1>,<p>,<meta>...).
Use case: When integrating a blog post, the tag <h1>was reserved for the main title, while the subtitles were structured with<h2>, guaranteeing both accessibility, reading clarity and good referencing.