Parametric CAD

defines a solid body through multiple steps and fully constrained geometry.
There is an underlying mathematical model of your part.
The difference between direct and parametric is comparable to Pixel vs Vector.


This allows us to use variables and placeholders to later change critical dimensions of our part without even modifying the geometry.
The Model updates according to our dimensions.
You can think of this like time travel (going back and changing your starting point)
or like variables in coding (your model is a function that takes in dimensions and spits out a 3D File)


This makes parametric CAD extremely well suited for mechanical designs