A dossier is a collection of documents or information about a particular person, event, or subject. It is typically used for research, investigation, or reference purposes. Dossiers can contain a variety of materials such as reports, photographs, correspondence, and other relevant data. They are often compiled and organized in a systematic manner to provide a comprehensive overview of the topic at hand. Dossiers are commonly used in academic, legal, and intelligence contexts to gather and present information in a structured and accessible format.