TYPO3's Built-In XML Sitemap
As soon as the core extension seo is active, every TYPO3 website automatically serves an XML sitemap at /sitemap.xml – with no additional configuration required. This sitemap is structured as an index: it points to a sub-sitemap containing all regular pages in the page tree, plus – if configured – further sub-sitemaps for additional content.
Content that doesn't exist as its own page in the page tree – for example individual news articles output via a plugin on a shared detail page – isn't included in the automatic sitemap by default. That requires a dedicated sitemap provider.