What Is Non Linear?

So we've been talking about all these linear relationships for a while now, but what is what is non linear? What is something that's non linear? Okue? So here we go. It's basically the opposite of what we were talking about. But there's a lot, yeu have a lot more options. Like, for example, a sign wave as like, a transformation as a function is non linear because, um, actually, i want to save this when we get into transformations. The whole idea is that you have like an expenential or a parabola or thing that's not like, nice and straight and all,. That's a thing that may be lest