A line graph, also known as a line plot or a line chart, is a graph that uses lines to connect individual data points. It is commonly used to display change over time as a series of data points connected by straight line segments on two axes. Line graphs are best used when you want to show how the value of something changes over time or compare how several things change over time relative to each other. They are especially helpful when it is necessary to create a graphical depiction of changes in values over time. Line graphs are often used in finance to create visual representations of values over time, including changes in the prices of securities, company revenue sheets, and histories of major stock indexes. They are also useful for comparing different securities. Line graphs are good to use when smaller changes exist, and it is necessary to track changes over short and long periods of time. They are also useful when trying to measure change over time, and the changes are larger. Scientists, engineers, salespersons, businesspersons, mathematicians, statisticians, governments, and private entities use line graphs to understand and derive meaning from large chunks of data, add depth and validation to their presentations, prove and solve their hypotheses and theorems, and showcase trends in different fields.