Descriptions are meant to give an overview of what your video is about so viewers and YouTube's discovery systems can make sense of your content. Descriptions should: Accurately describe your video in one or two concise sentences. Be consistent with the story of your thumbnail and title; all three - thumbnails, titles, and descriptions - are seen together in search results. Either continue the narrative of the title and thumbnail or add information that doesn’t fit in the title. Be creative! Include experience enhancing links (ex: time-stamps to specific moments in a video, links to complementary content, collaborator links, etc)