That this is going to be the integral, in this case, from a to b. And we're gonna learn a lot more depth. In this case, it is a definite integral of f of x, f of x dx. But you can already see the parallels here. You can view the integral sign as like a sigma notation, as a summation sign, but instead of taking the sum of a discrete number of things, you're taking the sum of an infinite number infinitely thin things. Instead of delta x, you now have dx, infinitesimally small things. And this is a notion of an integral.