A sitemap provides search engines with a clear roadmap of your site's structure, ensuring all important affiliate pages are discoverable—even those buried deep or with few internal links. This is especially helpful for large or frequently updated sites. An XML sitemap highlights new or updated content, prompting faster indexing, while an HTML sitemap enhances user navigation and internal linking. Both types contribute to better SEO performance. Including key affiliate pages in the sitemap ensures they are prioritized for crawling, increasing their chances of ranking. While a sitemap alone won't guarantee high rankings, it strengthens the technical foundation of your SEO strategy