"Supplementary" refers to something that is added to enhance or complete something else. In various contexts, it can mean additional materials, resources, or information that support the main content. For example, in education, supplementary materials like worksheets or videos can help students better understand a subject. In finance, supplementary information may include additional data provided alongside financial statements to give a clearer picture of a company's performance. This can involve details about assets, liabilities, or cash flow that are not fully covered in the main reports, helping stakeholders make informed decisions.