Integral calculus is concerned with finding the function, known as the antiderivative or integral, that would differentiate to give a given function. This process involves finding the area under the curve of a graphed function over an interval. To perform basic integrations, you can use antiderivative rules that are the reverse of differentiation rules, such as the power rule for integration, and add the constant of integration. Techniques like substitution and integration by parts are also used for more complex functions.