Historical data refers to information collected from past events, activities, or trends. This data can include statistics, records, and documents that provide insights into how things were at a specific time. Researchers and historians often use historical data to analyze patterns, understand changes over time, and make informed decisions based on past experiences. Examples of historical data include census records, economic reports, and weather patterns. By studying this information, we can learn about significant events, such as the impact of the Industrial Revolution or the effects of World War II on society. Historical data helps us understand our present and shape our future.