In the context of financial markets, historical data is information about a particular asset that has been collected over the years. The data can relate to pricing information, historical volatility levels, and more. Past data is essential due to the theory that it is indicative of the future performance of the asset. It is also used to analyze the collective behavior of market participants around particular events in the past. Today, historical data is essential for all means of analysis, including power trading models and analysis of market participants, regardless of their trading style, including retail traders, proprietary trading houses, quantitative trading firms, portfolio managers, and more.