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Error bars are graphical representations of the variability of data. They provide insights into the uncertainty or margin of error in a given measurement. Typically used in charts and graphs, error bars extend vertically or horizontally from data points to illustrate the range of values within which the true value is expected to fall. The length of the error bars can indicate the level of confidence in the data or the degree of variability among repeated measurements. This visual tool helps in interpreting the reliability of the data and comparing different sets effectively.