Regression Analysis is a set of statistical processes for estimating the relationships among variables. It involves modeling the dependent variable as a function of one or more independent variables to understand how the dependent variable changes when any of the independent variables are varied. Common types of regression analysis include linear regression, logistic regression, and polynomial regression. Regression analysis is used to predict outcomes, identify trends, and infer causal relationships between variables. It is widely applied in fields such as economics, finance, biology, and social sciences for forecasting, risk assessment, and hypothesis testing.