Semantic tags in HTML are elements that carry a meaning or purpose in the structure of a web page. These tags are used to describe the content on the page in a more meaningful and descriptive way. Examples of semantic tags in HTML5 include <header>, <nav>, <section>, <article>, <aside>, <footer>, and <main>.
These tags help to organize the content on a page and provide a clearer structure, which is useful for both human readers and search engine algorithms. Semantic markup can also help with accessibility, as it provides additional context and information for screen readers and other assistive technologies. By using semantic tags, web developers can create more meaningful, accessible, and SEO-friendly web pages.