Gauss's Theorem, also known as the Divergence Theorem, is a fundamental principle in vector calculus. It states that the total flux of a vector field through a closed surface is equal to the integral of the divergence of that field over the volume enclosed by the surface. This theorem connects surface integrals and volume integrals, making it easier to calculate complex fields. In physics, Gauss's Theorem is often applied in electromagnetism, where it helps determine electric fields. By using this theorem, one can simplify calculations involving electric flux and charge distributions, leading to a better understanding of how electric fields behave in different situations.