What tag is used to define a navigation section?

The tag that is used to define a navigation section is <nav>. This semantic HTML element specifically indicates that the enclosed links are intended for navigating through the website, typically representing a set of navigational links. By using the <nav> tag, developers can enhance the accessibility of their web pages, as assistive technologies can identify and interpret the navigation areas more effectively. This can help improve user experience by providing a clear structure to the navigational elements on a page.

The other tags serve different purposes. The <header> tag is used to define the header for a document or a section, typically containing introductory content or navigational links, but it is not limited to navigation alone. The <section> tag represents a thematic grouping of content, which may include multiple types of content and is not specific to navigation. The <link> tag is used to define relationships between the current document and external resources, mainly for linking stylesheets, and does not play a role in defining navigation.