Document types refer to the various categories of documents that serve different purposes in communication and record-keeping. Common examples include reports, invoices, letters, and contracts. Each type has its own format and structure, tailored to meet specific needs, such as legal requirements or business transactions. Understanding document types is essential for effective organization and retrieval of information. For instance, business proposals are designed to persuade, while technical manuals provide instructions. Recognizing these distinctions helps individuals and organizations manage their documentation efficiently and ensures that the right format is used for the intended audience.