URL Fragments
URL fragments, also known as hash fragments or anchors, are the part of a URL that follows the '#' symbol and is used to point to a specific section within a web page. They are client-side only, meaning they are not sent to the server during HTTP requests, and are commonly used for in-page navigation, bookmarking, or single-page application routing. This concept is fundamental in web development for enhancing user experience by allowing direct links to content within a page.
Developers should learn URL fragments to implement smooth in-page navigation, such as linking to headings or sections in long documents, which improves accessibility and usability. They are essential for single-page applications (SPAs) where client-side routing relies on fragments to manage views without full page reloads, as seen in frameworks like React Router or Vue Router. Additionally, fragments enable bookmarking specific parts of a page and are used in analytics to track user interactions within a site.