An XML sitemap is a simple file that lists all your important pages so search engines can find them easily. For a large affiliate site, it is better to split the sitemap into smaller parts instead of one big file. Each file can hold a set number of URLs, and then you create a main sitemap index to link them together. Focus on adding only useful pages, not thin or duplicate ones. Updating the sitemap regularly also helps. With this setup, what method would make managing updates easier over time?