This area chart is a graphical representation of data that shows the changes in values over a period of time. It is used to compare different values and illustrate the relationship between them. The area chart is a great way to visualize trends and patterns in data. It can be used to compare different categories
From Wikipedia
An area chart or area graph displays graphically quantitative data. It is based on the line chart. The area between axis and line are commonly emphasized with colors, textures and hatchings. Commonly one compares two or more quantities with an area chart.