What is the main purpose of an area graph?

The main purpose of an area graph is to visually represent quantitative data over time or categories, highlighting the cumulative total of a dataset. It effectively shows trends, patterns, and relationships between different groups by filling the area beneath the line with color or shading. This makes it easier for viewers to compare values and observe changes in magnitude, particularly in time series data. Area graphs are especially useful for illustrating the proportion of parts to a whole in a visually engaging way.