The distance traveled, this is the total length of path. Total length of path. So what are we talking about? Well, let's say, and we're going to introduce a little bit of calculus now. Let's say that we have a particle's velocity function. And so let's say our velocity as a function of time is equal to five minus t. Now this is a one-dimensional velocity function. Let's say it's just telling us our velocity in the horizontal direction.