Internal links play a dual role in improving UX and SEO. They guide users to related content, increasing their time spent on the site and providing easy access to relevant information, thus enhancing UX. Additionally, well-described internal links contribute to SEO by improving the site’s structure and aiding in content discovery. Call-to-action buttons, on the other hand, encourage specific user actions that can lead to conversions, making them valuable for both UX and SEO.