Principle purpose of this article is to Discuss on the Mean Value Theorem. Here explain Mean Value Theorem with mathematical explanation in calculus terms. Mean Value Theorem establishes a relation focusing the slope of a tangent line into a curve and the secant line through points on a curve at the endpoints of interval. The theorem is stated as follows. If a function f(x) is continuous on a closed interval (a, b) and differentiate on an open interval (a, b), then a minimum of one number c ∈ (a, b) exists so that, f'(c) = f(b) – f(a)/b-a.