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A line graph is specifically designed to show changes over time or the relationship between two variables by connecting individual data points with continuous lines. This type of graph is particularly useful for illustrating trends, such as how temperature changes throughout the day or how sales figures increase over several months.

In a line graph, the x-axis typically represents the independent variable, while the y-axis represents the dependent variable. By connecting the data points with lines, the graph allows viewers to easily see patterns, increases, or decreases across the dataset.

Bar graphs and pie charts, on the other hand, present data in a categorical format, focusing on quantity rather than trends over time. A scatter plot displays individual data points and their relationship but does not connect them with lines, which separates it from the function of a line graph.