Multiple regression is a statistical technique used to understand the relationship between one dependent variable and two or more independent variables. It helps in predicting outcomes and identifying the strength of predictors, making it a valuable tool in various fields such as economics, healthcare, and social sciences. By analyzing how multiple factors influence a single outcome, researchers can make informed decisions and develop strategies. For instance, in marketing, multiple regression can help determine how different advertising channels impact sales, allowing businesses to allocate resources more effectively.