Final answer:
A line graph represents a time series by plotting data points and connecting them with a line. It helps to display trends, relationships, or comparisons between variables, and is frequently used in fields like business and science.
Step-by-step explanation:
A line graph can show information over a period of time, which is called a time series. It is basically used to portray a trend, a relationship, or a comparison between two or more quantitative variables.
For example, a line graph can be used to track the sales of a product over several years, revealing if the sales are increasing, decreasing, or staying the same. Data points are plotted on a graph and then connected by a line to make it easy to see changes in data over time and to predict future trends based on these patterns. This makes line graphs a very valuable tool in many fields, including business and science.
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