Graph views provide a graphical view of the data, in the form of Bar chart, Pie chart, and Line chart. The graph view is an aggregation of all the records in a model, which is generally visualized in bar, pie, and line.
The default type of graph is a pie chart - to change it to a bar chart, we need to specify the type. You also may change the orientation. The graph view is used to visualize aggregations over a number of records or record groups.