A line graph displays data that changes continuously over periods of time.
A line graph or line chart or line plot is a graph that utilizes points and lines to represent change over time. It is a chart that shows a line joining several points or a line that shows the relation between the points. The graph represents quantitative data between two changing variables with a line or curve that joins a series of successive data points. A vertical axis and a horizontal axis are used in linear graphs to compare these two variables.