Line graph

A line graph is a type of chart used to show changes in data visually. When measured values are continuous, each data point is placed on the horizontal axis, and the corresponding value is plotted on the vertical axis. The midpoints of the data points are then connected, producing a line that lets you see trends and changes in the data at a glance. When the data are discrete, the individual measured values are placed on the horizontal axis and the frequency on the vertical axis, and the plotted points are connected to form the line. In this way, line graphs are well suited to showing the movement of many kinds of data, and they are often used to show changes over time.