Ans: Definite integrals are those which have both lower and upper limits given for an integral. In reality, you are calculating the area under the curve of x = c and x = d for function f(x) with a lower limit as c and an upper limit as b. For indefinite integrals, no upper or lower limits are provided. Here x can have a range of solutions because you calculate a general solution for a family of the same functions like f(x). In indefinite integrals, we need to add a fixed constant c, and the notation is written along with the solution we get. So this is the fundamental difference between definite and indefinite integrals of Exercise 7.6 Class 12 Maths NCERT solutions.