What is a line graph?

A line graph is characterized by a series of data points that are connected by straight lines. This type of graph is particularly useful for displaying trends over time, allowing the viewer to easily observe changes and patterns within the data. The connection between data points helps to illustrate relationships and movements, making it easier to interpret the data visually. In contrast, bar graphs use rectangular bars to represent data quantities, and pie graphs depict parts of a whole with slices, neither of which focuses on the continuity or trends demonstrated through connecting lines. Random lines do not provide meaningful information in the context of data representation, as they lack a structured format or connection to specific data points. Thus, the defining element of a line graph is its use of lines to show the correlation between numerical data.