There are many types of data that can be displayed in a graph. The most common types are numerical data and categorical data.
Numerical data is data that can be expressed in numbers, such as height, weight, or time. It is often easy to spot patterns in numerical data when it is displayed in a graph.
Categorical data is data that can be divided into groups, such as gender, type of food, or color. Categorical data is often represented in a bar graph or pie chart.