What is the purpose of a trend line in data representation?

The purpose of a trend line in data representation is to show the general direction of data over time or across different conditions. It simplifies complex datasets by providing a clear visual indication of the overall pattern, whether it's an upward trend, downward trend, or no significant change. By summarizing the key trajectory that the data points suggest, a trend line allows for easier interpretation and analysis, helping viewers quickly understand the relationship between variables.

In essence, trend lines serve as a tool for forecasting future values based on historical data trends, enabling users to identify potential growth patterns or declines, which is essential in fields such as business, economics, and scientific research.