gatsby-plugin-catch-links seamlessly intercepts local links within your Gatsby site's markdown or HTML content. It enhances user experience by preventing full page reloads when navigating between internal pages. By intercepting clicks on relative links, it leverages Gatsby's routing to ensure smooth, client-side transitions, improving perceived performance and providing a more app-like feel to your Gatsby website. It's a simple addition with a noticeable impact on site usability.