A historical document is a written or printed record that provides information about past events, people, or cultures. These documents can include letters, official records, diaries, treaties, and newspapers. They serve as primary sources for historians and researchers, helping to understand the context and significance of historical events. Examples of historical documents include the Declaration of Independence, Magna Carta, and Diaries of Anne Frank. Each of these documents offers insights into the values, beliefs, and circumstances of the time in which they were created, making them essential for studying history.