Regression is a statistical method used to understand the relationship between variables. It helps in predicting the value of a dependent variable based on the value of one or more independent variables. For example, in a simple linear regression, we might predict a person's weight based on their height. This technique is widely used in various fields, including economics, biology, and engineering. By analyzing historical data, regression models can provide insights and forecasts, making it a valuable tool for decision-making. Predictive Analytics and Data Science often rely on regression techniques to derive meaningful conclusions from data.