Which graph is commonly used to display data over time?

A line graph is commonly used to display data over time because it effectively illustrates trends and patterns in a dataset by connecting individual data points with a continuous line. This allows observers to easily visualize changes in values at specific intervals and see how one variable influences another over specified periods. Line graphs are particularly useful for tracking fluctuations, showing progress, or comparing multiple time series alongside one another.

In contrast, bar graphs are more suited for comparing quantities of different categories at a single point in time rather than illustrating changes over time. Histograms present frequency distributions of numerical data and are typically used for showcasing the distribution of a dataset rather than time-based changes. Pie charts are designed to show proportions of a whole at a single point in time, making them less effective for indicating trends over a continuum.