Spline editing? What does it mean?

I’ve heard the term of animating with splines? What does this mean exactly. I am guessing it means to animate using the ipo curve editor, but is that the real meaning? I would really appreciate an answer, thank you.

Well…In Poser they call it spline if the curves are curvy. And then there’s
also linear and constant. Just another catagory for interpolation types.
I’m pretty sure it’s just a term for a type of curve/IPO/whatever you want to call it.

Look here: http://en.wikipedia.org/wiki/Spline_(mathematics)

You can see the picture on the right to know what it looks like visually
and I’m sure you’ll feel familiar with it. You don’t have to read all the
math genius descriptions.

Yup. It’s the good ol’ IPO editor.

Thanks for the response, guys.