So let's say that my function, so let's say this right over here is, Y is equal to F of X, and we care about the behavior right over here when X is equal to C. This is my X axis, that's my Y axis. So we care about the behavior when X is equal to C. And so notice, from our first intuitive sense, I can definitely draw this function as we go through X equals C without picking up my pencil, so it feels continuous there. There's no jumps or discontinuities that we can tell. It just kind of keeps on going. It seems all connected is one way to think about it. But let's think about this definition. Well, the limit as X approaches C from the left, it is, as we approach from the left, it looks like it is approaching, it looks like it is approaching F of C. So this is the value F of C right over here.