A derivative measures how much one quantity changes with respect to another quantity. It represents the rate of change or slope of a function at any given point.
An integral calculates the area under or between curves by summing up infinitely many infinitesimal rectangles or slices. It can be thought of as reverse differentiation.
A limit describes what happens as one variable approaches a certain value or as it goes towards infinity or negative infinity. Limits are fundamental for understanding continuity, derivatives, and integrals in calculus.