What is Polynomial Regression? Linear Regression vs Polynomial Regression

 Polynomial Regression is an Advance method of Linear Regression.

Linear Regression draws a line between X and Y data values, we can check how well the relationship between X and Y.

Polynomial Regression draws a Curved Line which bends when relationship is unpredictable and non Linear. In a non-linear relationship, the connection between X and Y is not consistent. Sometimes when X increases, Y increases, Other times when X increases, Y decreases, and it can change direction multiple times.

Linear Regression → works best when the relationship between X and Y is proportional and predictable. The line just shows how much Y increases when X increases.

Polynomial Regression → works best when the relationship is non-linear or unpredictable. The curve bends up and down showing that sometimes X increases Y, sometimes decreases Y, depending on the data pattern.