About Rendening Intent

Hi, This is the first time I am writting a question on this forum…. My question is: I´m studying about colocor consistency. In advanced mode, below options of CMM, we have Rendening Intent. The options of one is: Perceptual, Saturate, Relative Colorimeter and Absolute Colorimeter. I have read many helps for that topics, and the unic that a knew to understand is Relative Colorimeter, which compares white points to translate a color space to another.
I would to understand how to functions othes: Perceptual, Saturate and Relative Colorimeter…

Thank´s
Gustavo Del Vechio.