Hello, I'm trying to model a smooth path between several control points inthree dimensions, the problem is that there doesn't appear to be an explanation on how to use splines to achieve this. Are splines a subset of other types of curves such as Bezier curve or the Hermite curve?

I have successfully found cubic splines in 2 dimensions, but I'm not sure how to extend it into 3 dimensions and why there is no explanation about this. Please help.