Integration is an important part of calculus. Integrals include single integral, double integral, as we will as multiple integrals. Various types of integral are used to find surface area as we will as the volume of geometric solids. The double integral, triple integral are some of the techniques. The mostly used ones are Gauss divergence theorem as we will as Stokes theorem in vector calculus. The Gauss divergence theorem produces results which relates the flow of the vector field vector field through a surface to the behavior of the vector field within the surface.