A specialised XML sitemap that lists video URLs along with metadata Google needs for video search and video-rich SERP features: thumbnail location, title, description, duration, content URL, player URL, family-friendly flag, live-stream status. Either a standalone file or extension namespace (
xmlns:video="http://www.google.com/schemas/sitemap-video/1.1") within a regular sitemap. Often combined with schema.org/VideoObject structured data on the page itself. Critical for any site where video discovery matters: tutorial sites, news publishers, and anyone targeting the video carousel on the SERP.