A trend line is a straight line that represents the general direction of data points on a graph. It helps to visualize patterns in data over time, making it easier to identify trends, such as increases or decreases. Trend lines are commonly used in various fields, including finance, economics, and science, to analyze historical data and make predictions. To create a trend line, data points are plotted on a graph, and a line is drawn that best fits these points. This line can be linear or nonlinear, depending on the nature of the data. Analysts often use trend lines to forecast future values based on past trends, aiding in decision-making processes.