Final answer:
Time series graphs, particularly line graphs, enable presentation data to automatically update and showcase changes over time, such as tracking the unemployment rate.
Step-by-step explanation:
The type of visualizations that enable the data in a presentation to automatically update and change over time are known as time series graphs. A line graph is the most effective format for illustrating a relationship between two variables that change, one of which is often time itself. For instance, line graphs can track patterns like the unemployment rate over time, presenting continuous data and revealing trends. They are particularly valuable in fields such as economics for showing changes in prices, wages, and other key economic indicators.
However, it should be noted that how line graphs are presented can influence how data is perceived. While they are excellent tools for showing patterns, the scales and axes can be manipulated to emphasize or de-emphasize certain trends. Hence, it is crucial to use these graphs judiciously to ensure accurate data representation.