A video sitemap provides Google and other search engines with data about all the video content on a particular website. With a video sitemap, site administrators can label their videos by category, title, description, running time, and intended audience. This helps the search engines find and characterize the video content on a site, which should improve the listing of that site in video search results.
When a video encoded in an acceptable format is submitted using a sitemap, the included URLs for the videos are made searchable through Google, Yahoo, or Bing. When that video appears in search results, users will see a thumbnail image of the video content and related information, which is pulled from the sitemap. They are then directed to the original website for video playback. Clearly, video sitemaps are extremely important in making your videos easier to find on the web.