An antiderivative is a function that reverses the process of differentiation. In simpler terms, if you have a function that describes how something changes, the antiderivative gives you the original function before that change occurred. For example, if you know the speed of a car over time, the antiderivative can help you find the total distance traveled. Finding an antiderivative is also known as integration. The process involves determining a function whose derivative matches the given function. Every antiderivative has a constant added to it, known as the constant of integration, because differentiating a constant results in zero.