What are Trend lines in Tableau? How to use them?

The tableau trend line shows or reveals unique patterns in data. Using trend lines we can discover new patterns emerging from data points present in a graph or chart.

For instance, if we have a trend line over a sales chart, we can infer whether the sales are increasing with time,decreasing or not changing at all.

Also, trend lines help us in interpreting data trends, predicting future scenarios and draw a correlation between two variables in the analysis.