The X axis shows what type of data (data: information without context, eg a list of students with numbers beside their the names is data, when it’s made clear that those numbers represent their placing in a 100 meter race, the data becomes information) each column represents, and the Y axis Showa a value for that types of data. For example, in a rainfall graph, each column on the X axis represents a month of the year, with the height of each column on the Y axis showing the amount of rainfall in that month.