Annotation is the process of adding notes or comments to a text, image, or other content to provide additional information or context. This practice helps readers understand the material better by highlighting important points, summarizing sections, or offering explanations. For example, students often use annotations while studying books to clarify complex ideas or remember key concepts. In the digital world, annotation can also refer to marking up webpages or documents with tools that allow users to share insights or collaborate. This is especially useful in academic and professional settings, where teams can discuss and refine ideas directly on the content they are working with.