What is the primary function of end screens on a YouTube video?

The primary function of end screens on a YouTube video is to keep viewers engaged within the channel's ecosystem by providing clear calls to action that encourage them to watch more content, subscribe to the channel, or visit external websites. End screens appear during the last 5-20 seconds of a video and allow creators to display clickable elements, such as other videos, playlists, subscription buttons, and website links. These elements serve as prompts that guide viewers towards further interaction with the channel, increasing watch time, subscriber growth, and potential conversions. By strategically using end screens, creators can effectively retain viewers and maximize their engagement with the channel beyond a single video.