A line graph, also known as a line chart, is a visual representation of data that shows a series of points connected by straight lines. In mathematics and statistics, line graphs are commonly used to illustrate trends over time or relationships between two variables. However, there are several other words that can be used to describe a line graph, including trend chart, time series plot, trend line graph, and trend analysis chart. Each of these terms emphasizes the purpose and function of a line graph in a specific context, whether it be for tracking changes in a business's sales or analyzing patterns in climate data.