The indefinite integral is one of the most important ideas in math. The idea is part of the branch of math called calculus. In Class 12, you learn about this important chapter. The indefinite integral is a function that does the opposite of what another process does. An indefinite integral can be shown by an integral symbol with a (x) at the end. Since the derivative of a constant is zero, Indefinite Integral is not unique. Integration is the process that students use to find the indefinite integral. In other words, the indefinite integral is the process of integrating a function, which is like doing differentiation backwards.