The “curl of grad” refers to the vector operation that combines the curl, which measures the circulation of a vector field, and the gradient, which indicates the direction of greatest change in a scalar field. Stokes’ Theorem establishes a connection between these two quantities, relating the circulation of a vector field to the curl of its gradient. In physics, the curl of a vector field can represent rotation, such as wind around a point, while the gradient represents the direction of change, such as temperature in heat conduction.