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A data series refers to a sequence of data points that are typically organized in a specific order, often over time. It can be used in various fields such as statistics, finance, and research to analyze trends, patterns, or correlations. Data series can represent various metrics, such as sales figures, temperature changes, or stock prices, and are crucial for forecasting and decision-making processes. Understanding data series involves analyzing their characteristics, such as mean, median, variance, and seasonality, to derive meaningful insights.