Many knowledge is connected in math. In my opinion, integration is expressed by anti-derivative form. anti-derivative is the method to do integration. So some students may confused with these two concepts, since they might think they are basically same.

Anti-derivative is the inverse operation of the derivative, which in order to find what value results this result. This is the method via derivative to get the answer.

Integration is the opposite concept with derivative. The integration is to find the area under the certain interval or uncertain interval.

Some students may think they can just use anti-derivative to represent the integration. However anti-derivative does not have interval.

According to these two concepts, we can see that anti-derivative is the method to solve integration problem, since students need find the integration via anti-derivative which can represent the uncertain interval result for integration. So anti-derivative is the crucial way to calculate the  integration.