What is the purpose of the lm function in the R language?

The lm function in R language is used for linear regression analysis, aiming to fit a linear model. Its purpose is to fit an optimal linear regression line by using the method of least squares based on the given independent and dependent variable data, in order to describe the relationship between the two variables. This function helps users analyze linear relationships between data and predict the values of the dependent variable. With the lm function, users can obtain related statistical information such as regression coefficients, residuals, and goodness of fit of the model.