The Chain Rule is a fundamental concept in calculus that helps us find the derivative of composite functions. When you have a function inside another function, the Chain Rule allows you to differentiate them step by step. For example, if you have a function like f(g(x)), the Chain Rule states that the derivative is the derivative of the outer function multiplied by the derivative of the inner function. To apply the Chain Rule, you first identify the outer and inner functions. Then, you differentiate the outer function while keeping the inner function unchanged, and finally, multiply by the derivative of the inner function. This method simplifies the process of finding derivatives for complex functions.