👉 In physics and mathematics, a peak is a point in a function or graph where its derivative (the slope) changes sign. This phenomenon occurs when there are multiple local minima or maxima in a region of a function. For example: - For the function f(x) = x^2 - 4x + 3, the derivative f'(x) = 2x - 4, which has a positive slope at x=1 and is equal to zero at x=-2