Notes are supplementary pieces of information that enhance understanding and provide context to primary content. They can take various forms, such as annotations, comments, or footnotes, and are commonly used in academic, professional, and personal settings. In digital environments, notes can be added to documents, code, or multimedia content, allowing users to capture insights, clarify complex ideas, or reference additional resources. Tools like Git enable users to attach notes to commits, while Markdown allows for organized footnotes in documentation. Overall, notes serve as valuable aids for communication and comprehension, facilitating deeper engagement with the material.