What is the difference between differential and integral calculus?

Differential calculus is about rates of change and slopes of curves, helping us understand how one quantity changes in relation to another. It's useful for analyzing motion, growth, or decline. Integral calculus, on the other hand, is about accumulation—like finding the total area under a curve, or the total distance traveled over time. It’s used when we want to add up small pieces to find a whole. While they seem different, both branches are connected: one undoes the other. Together, they form a complete picture of how things change and accumulate in the world around us.