Content ID is a system developed by YouTube to help copyright owners manage their content on the platform. It automatically scans uploaded videos to identify copyrighted material, such as music, images, or video clips, and allows copyright holders to take action if their content is used without permission. When a video is matched with a copyrighted work, the copyright owner can choose to block the video, monetize it by placing ads, or track its viewership statistics. This helps protect the rights of creators while allowing YouTube users to share and discover content more easily.