f'(c) = [f(b)-f(a)]/b-a

Derivative: The derivative represents the instantaneous rate of change (slope) at any given point on a curve or graph. It provides information about how quickly one variable changes with respect to another.

Secant Line: A secant line is a straight line that intersects a curve at two points. It can be used to approximate the slope of the curve between those two points.

Limit: The limit is a fundamental concept in calculus that describes the behavior of a function as its input approaches a certain value or infinity. It helps determine the derivative and other important properties of functions.